Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b15788bf73968b…

MALICIOUS

PDF

79.1 KB Created: 2021-06-25 19:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ab71c70a8523d71473ebcd086bbfd89 SHA-1: ea45402052f94c01cb5afd856efaf793f21f3242 SHA-256: c3b15788bf73968b8bdc1e13f4a8031dcf46da457bccb3484558bf906fc7a2c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gym-rectif.fr/ckfinder/userfiles/files/54219344168.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/dh4dq2ivhrfgsoham3a91opemc/46188362392.pdf
    • http://greaterdeliveranceministries1.com/clients/61527/File/6111555977.pdf
    • https://thefertilizergranulator.com/d/files/78311780067.pdf
    • https://ikima.fr/uploads/file/lerokinevivenuxogitoxono.pdf
    • http://stardentalcare.org/userfiles/file/17473340994.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/053fbd1256881f544e0ff7c44a02594e/doxagadezigomuluzagi.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2tcv8r4ak49dq3krv4uplqhku5/61476656712.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rmd48hqn46lineb1vsjrvfo2l5/32498235032.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wuzuwexu.pdf
    • http://campbellelectronics.com/uploads/tabenokamadidixiwagavuj.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/mj8q3q184t7p2m5qh8g9pj2hai/14242322024.pdf
    • http://wowbond.com/upload/Fckeditor/file/16157668439.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9375814b---xapasazonabusuzuxol.pdf
    • http://veraschwemmle.de/fckdata/file/vovudewowige.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160781d2ac1dbf---21026169792.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/k996aonvbg303ntr0qa2la2j73/jedegavopoziviti.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5b8c83162dd2287ccc0c8e6940757130/36459071916.pdf
    • http://yasaitogo.com/uploads/files/78547627302.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/80df12464fc3d464766548b295be4991/jilujejimedojaxuv.pdf
    • http://www.derbysignandgraphics.com/uploads/file/44313820310.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mpm6ra00a968ltja98m67qvob6/kerafuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=update+table+multiple+columns
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3c93e00f60344efe5536e68325c911f0/virofexaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0eb.bin
4cabe9a735cdcc87f804a93a189145e2f9b4aa0fb590795e3a83aa9e8bddad4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 10820 bytes
font_01_sfnt_off0000e999.bin
f1902b85eba52592f027a6f8a5ec80dc38f850e2ae97b89e8f9334d1e803bd93
pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 17364 bytes
font_02_sfnt_off0001171a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 16792 bytes