Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbda21f304ecf3d…

MALICIOUS

PDF

86.2 KB Created: 2021-08-02 21:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7851241fe68aa624080431aff6f66993 SHA-1: 18f5317c71f6cff431b08a3d36c208695cbe4a0c SHA-256: fbbda21f304ecf3d5585bf4bcec903d91001835fc3f7761984548b37a52cc064
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links, many of which point to compromised WordPress sites and appear to be part of a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160892ca88a485---57942574724.pdf In PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/wuxefovoboraxoz.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec08a3bfe2---tinosadewofapopufak.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lc7cq27kvf1oeos3tb55r417l5/wokokawopiwelexune.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061119563940.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aae7654da---lafobuwewinesogupezotojo.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/69440980381.pdfIn PDF document text
    • http://tw-go.org/files/80591343627.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6c0806278---juvejiso.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/73ea687194cf1f62d2c3f9fdcc927973/godimajinofuxurosazibif.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/13870060985.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210625_213646.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1db15459---refurorikunizavezi.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/19159383728.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d2946b3eb---sofonunuvelo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/bed7aba4ee38e2fe6bc1024039e94857/63841384254.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d35276898---93742349325.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/rogexekazapimoper.pdfIn PDF document text
    • http://chinalabware.ru/d/files/10222831190.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc09b05cf61---zezinugazamigazotu.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210626090728.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e1f51ddabe668647bdabb230db0add35/31881208897.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/42538628957.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/juponipibu.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a22006fab835670457382f10b52fc1d6/85212206961.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/63986710634.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210614062429727535319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kenwood+th-f7e+software+downloadPDF 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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10520 bytes
SHA-256: 546e8db32b1cb8f56f96ccddd861e6fd827990267e7631f030577b5475954896
font_02_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 20504 bytes
SHA-256: 9964bb684b4cda52ed8e5be8e30e5ecb5714eb6b1abb7b834765d91b03cbbdb4

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