Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f57407ef21fb469…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 14:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e7102d784356621975283d62f96f008 SHA-1: dc7eda73aa5784d61a6643e6d6a7fb56f83d40d6 SHA-256: 4f57407ef21fb469fd118a41a6ceb711eacbeed88d6cbdc83022678c25711e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=best+dns+changer+for+android
    • http://cl-metalparts.com/d/files/96582802878.pdf
    • https://ritascreation.com/userfiles/file/witebulezovadafekafuw.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/601c53929360a3e6fe132fe48d58761c/fumejorubalate.pdf
    • https://onutglen.com/caningest/images/file/wofekuzodupawetivubobuwed.pdf
    • https://facades-et-traditions.com/actualites/file/jipobej.pdf
    • http://wajl.net/img/file/2021981718.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/39787742088.pdf
    • http://ttworld.hu/uploads/content_files/files/filijomet.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/2670518966.pdf
    • http://fanta-life.com/userfiles/file/wuwudalodowawiwov.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/oo2np3mkf51mstu7shmtr1ubsd/41182979280.pdf
    • http://szao-spb.ru/images/news/file/13973597779.pdf
    • http://grotech.in/userfiles/file/66105491250.pdf
    • https://dichvumayphoto.vn/webroot/img/files/75571944273.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/wajoretuji.pdf
    • http://fszhenjia.com/upfolder/e/files/20210903235022.pdf
    • http://studiosiciliani.eu/userfiles/files/66581562197.pdf
    • https://dollarplus98.com/images/upload/files/3298326912.pdf
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lazekufasovezenusefonene.pdf
    • http://travelspace.pl/userfiles/file/pobokuna.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f94f999a0cc33ca9c1f945a34fb574c8/76740913115.pdf
    • http://farmaciafoglia.eu/userfiles/files/55579354998.pdf
    • http://bike-aholic.com/UserFiles/file/37884530611.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/molasixoroxedojesagir.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_off0000d910.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 16792 bytes
font_01_sfnt_off0000f122.bin
dc415eca4f94cd0559e2adf17486c588ad478f8b0adbdb18de232cc5e6b6137a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 19292 bytes
font_02_sfnt_off00012355.bin
1d621a1649529d9dd6202d3b69b72fdc108b26ece7f83a2ae7851e88605c0fa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 10764 bytes