Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa3044aabe19628…

MALICIOUS

PDF

95.6 KB Created: 2021-08-15 09:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cd4cdb7a94986c4330d1e6c6db96450 SHA-1: 2e8fd2b7288c5ce1d634591351e8dc0337870d82 SHA-256: 9aa3044aabe196288bb6ddb07cbccfb1b1da8a9a22b6920ed5224ca6c3ba1e4e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not explicitly detailed, is a common vector for malicious PDFs to initiate further malicious actions. The overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=brahma+chinta+book+pdf PDF link annotation
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b17d9d4a---73331811665.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bu3hu8i052ti6ppr4ituu7lunf/kagujanidaxunoxewijimuv.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/18970496057.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9e5520b0---44070295990.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a6ed51c3---55451416231.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/70484515239.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bipokajoxezix.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/82818137089.pdfIn PDF document text
    • http://healthywithhart.com/res/file/pazutafapoditoka.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/89355542581.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/vodozotuzosewi.pdfIn PDF document text
    • http://enewind.com/pliki/file/xawojosasudezolozo.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8d90ad7b4a9f40974cc913864b27a1d9/pibupi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nfcagv7pu0eoc79qgc38isd3n2/fejiwokawajatupofupe.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/54292490392.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zomenuv.pdfIn PDF document text
    • https://soechi.com/userfiles/file/talubi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16110355473259---96198283790.pdfPDF link annotation
    • https://kiameds.com/images/upload/files/10412394777.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/77140139019.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610312e942220---terafakaviluvodinemoreleg.pdfIn PDF document text
    • http://delve-cr.com/uploads/funenolapifupubakokuropim.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/bomudemugijuwedin.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cdebe0334---zazuto.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ba26e4f2b95916d1372759c00ff5e4bf/kezomuzij.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a625858fe53---54028015190.pdfIn PDF document text
    • 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_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 10824 bytes
SHA-256: 94415fcf605aaf4d8f65a1454fca761859e189c8e77d6ee41aa607dea7beb620
font_02_sfnt_off00014383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14383 17104 bytes
SHA-256: b4d908ae8e2ab4c5dde4e16c826ada9f546575993620411c2a0237e440693e57

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