Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0ee3977e54874d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 15:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 242fc2c9044c14c786a81822ca93ca3f SHA-1: 5bffcd0a0a57d1c02fd18455c2c156ded2725ae8 SHA-256: 6c0ee3977e54874d8ac5e7c1ed7a23467d01e2001bb7fa05d020913b19c9608f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://burfel.ru/upfiles/files/gutewikasivufude.pdf In PDF document text
    • http://biometria.pl/photos_fck/file/24114906197.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/589a0d0094fec9fad64281a3bff2d38e/narinukixim.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8k7milga2sg5ot2eacmk2g189v/kekenujedomurogak.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/liratulosujeti.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113568467753---bawarirofetelaroweburefe.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/78766681576.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ee5b3167a---loratupesukojigekakax.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c96edad06---28577017833.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/safevadudevopeli.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/kamegiluwapoturowug.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/23033777349.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/93252101095.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/77050774541.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c367a14d46---wenug.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091e5bd23751---92727580855.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/zutatumajezose.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ba02fe27ca53d5120d424aa246703102/49767250964.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210508093814.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/renez.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/jadokupikagenajabidu.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/bimaruzu.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/bekasoruvubojas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=computer+safety+precautions+pdfPDF 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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 10980 bytes
SHA-256: eb69586a36a69026a7dd16b480513a77bf4392bdfc7a96d9df30f1642d2a5069
font_01_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 17160 bytes
SHA-256: 65a6b002bf3ca7cffa791a01421f182bcbacc8f1fba7107574263d849f55f2e7
font_02_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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