Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae672bd40317e498…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 00:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a38bf1b2104d5408afb50ac7cb49aadb SHA-1: 4ab5ddeed0e642dfc49f59aa36d440acdd96c765 SHA-256: ae672bd40317e49859a9f014f4df2c041bd17300e35a620d821fe0cf549f8468
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and numerous external links are characteristic of a lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=super+mario+odyssey+guide+pdf+download PDF link annotation
    • https://bnbtravels.com/ckfinder/userfiles/files/pexinopogixelu.pdfIn PDF document text
    • http://goref.ru/files/file/6741138045.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/dejagisaxajupaj.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5311001c---54138612318.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd379bbc2c---lesed.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/47536651953.pdfIn PDF document text
    • http://medica-brno.com/files/84481441184.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/gokudewudosukutoposovu.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/17814546204.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/toxefoganovev.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/16574773322.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/82434128436.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/poforuweterutu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f426c971e5427f3f28aef8d6bfc28921/gowapobobapolij.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/rogifitomu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/95dac3151bd8c6c6d0dadc3e8e0b5b5a/tenonotifesujujuzegidibe.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d9b2a07a30b9163bb8cf558bd706f8a8/lulosabonekag.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/67174806361.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/92437856766.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fos7agibu0jegprqt08n44mgs4/2343612562.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/sikazeroj.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/80283851031.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160786209c6066---11975380991.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7pn79p0pf38u21io0o6ts987f4/61966631994.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a860b8e792adca37a191005e8d041d97/42024060503.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_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 11116 bytes
SHA-256: b82c17f77b82baba77bdfc66e0eee4b41fff0d0bb81eb10df162991b72313704
font_01_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 18516 bytes
SHA-256: 7360c7ec4a6c722099d8e3ddacfe4aa476bffaf42219219c231c85a6ce71b751
font_02_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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