Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f41fb45950a15c…

MALICIOUS

PDF

89.7 KB Created: 2021-08-17 23:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4d4aeebcee6248fb6610a29a2f2a7c7 SHA-1: 965a8b5b38ac2092b0cd4a167dc7ce4a96aab016 SHA-256: f8f41fb45950a15cf71aa98b02eb71030bc51aedcf2b2e459379ca68a312ea18
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://radissonhoteltraining.com/userfiles/file/barigupobemegatofoza.pdf In PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/af01d5e2d64fedfc97d7bb5d1bca31ff/zuwupapaxilajunubab.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/zizateje.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/27812693596.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/76991253824.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/zenenitogixaxin.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/kuditeselosi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/37c4562469a8ba53da87ed5bdaed4d9f/47978261883.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2qf7264nuuvkao46e88pnlj5rk/280519234.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878d0eb410e---fikewofatolobelawu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/jigewadodumozubuw.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c79039de6---kikitirinewopevikidup.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/97877889149.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ndge7o29572qddl7a8as7ovb78/38931815240.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14f0b72bad---30936465813.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/f5l51q6ngrbb8vhigfkr3uau3s/91500972822.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd29c8c1af---58631578555.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210702014953.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/26510751750.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/89906837127.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/51359536896.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/dukufa.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/32f317a360d5473bb9a50e35c50862a9/regazuvunawidij.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e41528ba0---geburozijebineridijitew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=personal+finance+planning+excel+templatePDF 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_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 16544 bytes
SHA-256: 4e890df3550d6fc8bb4402e247578530422fea4dbefb728aff08512543a63407
font_01_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 10928 bytes
SHA-256: 54361d4d6abbd535b75170e95ebd67e71da84346521d4923d9d71ef52a45f250
font_02_sfnt_off00013f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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