Malicious PDF — malware analysis report

Static analysis result for SHA-256 a172257d5a6f0dcd…

MALICIOUS

PDF

98.2 KB Created: 2021-07-14 06:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6157b759c0b75e3288307149b6925604 SHA-1: 717963f6126b5e1c00740247e1f76df6d16fa964 SHA-256: a172257d5a6f0dcd95c4243e4c43185bfca2b4478c9fa1947c35db73d17f77eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating a lure for remote-support tools. The document body is heavily obfuscated, but the presence of numerous links to compromised WordPress sites and external URLs suggests an attempt to redirect the user to malicious content or downloads. The primary attack vector appears to be social engineering, leveraging the 'remote-support tool lure' heuristic to trick the user into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/54836722a4bf6bd816b7e034dc57fc09/21527390793.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/76afc5d0771c7d6eddc1ad3711aa7c1b/funef.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/2b664ef637b71dde54712b5b18dcc5e0/lifikiz.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/59eab5bc5f08a15dfea1bd13e6095aaf/76673848833.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/susejavogefedidafax.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29ae9b7cbdd7ccef5e4b45201279e73/vesemedusatukax.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/72181982889.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/jujebajisiv.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zapodatojowojasafas.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o43fkn4l61q9ep7l3667e7suf3/7822786660.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a206de7459f---3963088280.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076201ecf17f---bezabe.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/56ed5e386b0a512092b7ba85e7b778b1/numufaditige.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4c87bbbb3614a0c77d15ce780b67b521/murulupavatejetevinejese.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090db4d81d7a---82129742486.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/mobexozatel.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070386b46d43---bapitefotobanulebaker.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c76274a3f---42737246652.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/10a5930c5a7e40cfd0b7ab117b3b82d9/43269810664.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/55264286532.pdfIn PDF document text
    • http://soles2walk.cz/data/file/41943413820.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/tulinofabus.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977b957524---fubukidaf.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c277a8bf1f---xalijerizinuxagi.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/47912581784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=clarion+nx+700+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 3316 bytes
SHA-256: 10796f7bcfa86f3881fe6a82afb50c0a3ff379a3d82359627fcf3e4f22f20090
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 17296 bytes
SHA-256: d0d9790bdd04e6a67b564b4f0102ae7bec41585e4651ef9a7539273f49231f12
font_03_sfnt_off000163c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C2 10276 bytes
SHA-256: b252105aad253c2489418df6d640553e8f5888e1116214fdfe299a423879523a

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