Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f23d03d797af949…

MALICIOUS

PDF

90.3 KB Created: 2021-08-14 19:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5574d6e3b8670bf5252f47f435f17f2a SHA-1: af4f77cff7ef88b29eb12ac22fc0a3eaee682908 SHA-256: 1f23d03d797af94944f3255c5a2b05c1304250fa75b72cfdb1c08cef4ac5a2c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=the+kissing+booth+book+series+in+order
    • http://artside.org/data/temp/file/18080947927.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b518d33d97c---98677517074.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb116954d---87655094660.pdf
    • https://ecoretras.com/file/27348946130.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3cbf2ad0edc3801fcd1956ccd5879b11/96587290440.pdf
    • http://houselandia.ru/files/64297341674.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080d15468b71---10092739537.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/41059116798.pdf
    • http://jfhconsultancy.nl/userfiles/files/66749710504.pdf
    • https://loyallcanada.ca/editor_files/file/turejelagoxikoxurezidig.pdf
    • http://lapempi.nl/ckfinder/userfiles/files/gunoliditujarugawuwe.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d4193d75---bezevamuku.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075961ce8c42---92512381579.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5e4b658f---77520966213.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9093ac5d---mujawad.pdf
    • http://somsit.com/ckfinder/userfiles/files/benudusijozudugaf.pdf
    • https://baxsporthorses.nl/userfiles/file/zoxibolasuj.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fjd1n3lernuldlp01vo3avflgv/zavokolapafovojezokum.pdf
    • http://k1a.ru/images/files/file/wokusalidujubepabu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc034e710---birutovajines.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kkpq2a56p6nttcmncpcjasjkis/42657868765.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2f9c76e7---77261634235.pdf
    • http://zlhk.ru/upload_picture/file/97213908558.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b787cf541d2---tometajosukegivodak.pdf
    • http://geombiagioschettino.eu/userfiles/files/57627208465.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_off0000fbf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 16792 bytes
font_01_sfnt_off00011402.bin
08c6af70dac5e05dac589437c709218e1f07b4be56f773b61d00301493adf5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 17304 bytes
font_02_sfnt_off00014114.bin
1b4c18b1b5b9d1544a49fa7cbada848acc0238d7e435bb69ab7877923a617348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14114 10512 bytes

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