Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcb5ac7675abab4…

MALICIOUS

PDF

86.1 KB Created: 2021-07-21 03:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9be769d69925934f9fa8ebd8478d7a71 SHA-1: b7a1bfae3b9433a3f07257fb5db2228fdbedc04e SHA-256: dbcb5ac7675abab4e96bcc40c22f18bcd8bfc08d643bfa409eb4a52ecee46b68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are likely compromised or disposable, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm indicators strongly suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://lab4050.com/upload/editor/file/ligoxutolepijafimasigeweb.pdf In PDF document text
    • http://accessprecision.com/userfiles/file/kiletovuwanelegojom.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441b9a3f0b---mirusemetuzofuw.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2bf80264f8e2797ad2568e01507ee62/nabalekigoweze.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/36970785183.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/96707871080.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tojufivojaritilu.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/65282376917.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/2bqg4fv8a0f7drde23p9vh4b4g/22315116078.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/30068130268.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc1d6b76a---91014161919.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7lpomcsjsh76fmjr2cfb400e66/zagaramipivazifasire.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f755ed4f---tozegoxisijexitoreletukaj.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/berafolutasaxezijudonod.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/vasepafuzisagi.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/55230768276.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b2d5ffe0---kifekuvuziwe.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/gbtv4f7dsu4c34io6opf8hmst0/99660590990.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/95319942217.pdfIn PDF document text
    • http://remobudostol.pl/pliki/27841859426.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/nubonutepegukirujaxoj.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/83585645598.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/38799013368.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/28e715586f099853ec8941c24be1fd88/90396306495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+merge+many+pdf+files+into+onePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 11032 bytes
SHA-256: 1ea9a7b4882ae3da659f03c565ed9a1c51bfbb2f6902832bd4f014d8a5bbb738
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 17384 bytes
SHA-256: 997341eebb1f26801b86045af36ec75f65b5e5b2a58eceb9e477b5c5f06c2f13
font_02_sfnt_off0001312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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