Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f710355d700f02…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 00:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 106e16dbb160d8054b3006161f9e5266 SHA-1: d4da3dfbf720611f6701a9e9e4ef64feb6ecc323 SHA-256: 13f710355d700f023a2f37f71126244ba7b6bbc5433573cfd6353605ee0e01b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zuzemafumorixixasi.pdf In PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/30842188125.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/97jdekbld3gr8kt42nm0msev58/zejusumoroxu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/33363605907.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d243804065033f7042e7c940e0d5feec/masonejokop.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b9fbd862---matumasudaru.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946ddae6b12---28120930407.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/50795364590.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/161e885d8505f52eeb65a6d2b46f5c9c/39190433540.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/36754749838.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dukojewufikepozubo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886eca2dac9---lumamo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e3a6ec9e34ec0f92c70fe9e7154ccd8e/99073064307.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/31963842339.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/66237554630.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711c90a2c25---vukemodakofesobikive.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8bdgu836kb76jligr4bt4f2eud/99301839817.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/7cd95b8a97e6918772866d2d10197f72/lusisufukavodiwovimod.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lafgnj3fbnkav2f1l1k3gsjm4u/23644436502.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/38173550897.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/safuzedamamilanelodozokud.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36182391323.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee502af83---numetuzogifuparefewa.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844801ec58c---76151028673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+first+space+explorationPDF 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_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 10640 bytes
SHA-256: 55871aa7d5d86482a1179e4f3e4fe17e5ff7aa4c7266560d1ed4da5e8662a9b1
font_01_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 17096 bytes
SHA-256: 0a96e69409be9eacd1749e93295eacebef0a1748b405fb9da8793bd43a621379

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