Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a421e2ed3a0fea…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 09:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abb3580c107d0dcb6b3a99467b6488d5 SHA-1: d05ceb998ca8e75c3a51e6dbd65a7f245ab87a89 SHA-256: b1a421e2ed3a0fea382aa2924ae6f207a097cdb0d1b04aae0c7ec4d22b7170ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://hohsingfiber.com/ufiles/files/52561614024.pdf In PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/31260362693.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b944e6f20eb---81410709149.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f2accaae0624910836374fd600ff3528/pefosok.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/noth8nstgfg9cipbcjq2aghekh/safutupijufojotudizuwubi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608493a32d79c---letinodilepi.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/dudobavizubegegugemivev.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1kr284dfos89e90v6ub5ca29b7/96287363083.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/xapalefeneranar.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/ravaji.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/e5ae6f3c4594a7745944a01ffd755aa6/24289835982.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/4f77eb8edaf3640879b5063ad850c175/zijawelujevar.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/69906856433.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3ac7411c---42790433815.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30594487788.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a09758d0---zejuwoxexibonos.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/69738851106.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/55efef9e5c1146a5abdbe290b540f652/9817843442.pdfIn PDF document text
    • http://brlairport.com/images/file/65671348631.pdfIn PDF document text
    • http://mousike.it/img_ins/files/1777162960.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-23/20210523135450490131.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/61265a02b2213dce9d9518059b5a89c1/riponagubax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=without+a+crystal+ball+llcPDF 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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 17232 bytes
SHA-256: 484a768e5d86da12dbfea0b4d79dea5d3f815caf585d943b70e1f21b11199fc3
font_02_sfnt_off00012cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEC 10436 bytes
SHA-256: d138493484e0f00881036be4dd7283e261082b23571d64ed1ecc094951738703

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