Malicious PDF — malware analysis report

Static analysis result for SHA-256 af40ad9f295c5c99…

MALICIOUS

PDF

83.7 KB Created: 2021-08-13 19:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f221b782c7fe43bdc14bcf70cc76a53 SHA-1: 4f637a785bd25664e6e786cbc9006704f6a17ca9 SHA-256: af40ad9f295c5c9972b9946fe04adef7d23fbaf7f63f8814e0343223411d4c19
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://infrive.ru/uplcv?utm_term=how+do+i+clean+my+cleverspa+filter PDF link annotation
    • https://digireg.ch/upload/47450684312.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ba6871d619c6fb2398743a00793d9388/6902956045.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9tbq5u5v65un2o7gcn2tbk62e6/62131010220.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/birezenasipat.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/93462569249.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d55abf656dff699afa8ece55f23261dc/bevobimibexazugetimig.pdfIn PDF document text
    • https://coatielectronica.com/files/31040030772.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/47702147541.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/zevizubefijudopixerupa.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16255940955591.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/95161020165.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/12223477301.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/265c250013662c2bb6af781a1da050c1/72423017969.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210807004813318.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098117504a50---98063869854.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092379c36461---wagajuripominaposi.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/67975603843.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e570150805711fc859052325299272a3/sowonagogami.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3f4fef5221bbbd75b44753b0eef6d53a/ponutisumezapepe.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/fakuvov.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/88178024256.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/laxawaketuverejevuf.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hu6bhhb3jg95le9frrulcdoe4r/vulifoto.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ldbimjdvnanvfluj32rgvbiiv3/vuzidejunexikap.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/11055773016.pdfIn PDF document text
    • https://computerzone.pk/file/5207866940.pdfIn PDF document text
    • 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_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 11040 bytes
SHA-256: 177f24f0964d3781aabb689a95892441b96fb0144e62aebf45c5aa705d3cbb18
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 17580 bytes
SHA-256: c871ac3ebad185d848dcea70177bcdb8015de68c5ab557d7abef71ca0678ee6c
font_02_sfnt_off00012861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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