Malicious PDF — malware analysis report

Static analysis result for SHA-256 358dd3673773a63e…

MALICIOUS

PDF

90.9 KB Created: 2021-08-08 21:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: de3200208b7798797eeb7a0ab01547a2 SHA-1: 26a6e7f7db0e44bdaa0037bb12f4c10a7263f727 SHA-256: 358dd3673773a63e7241bc81b27ba7fb41f9ee480210968063f7a8710d8b3931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/34510029842.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160956b3579655---77772545809.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/811289413d2d5f2b345d14c47a3ccf19/pogigatogopelenuk.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/78547507553.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935406c9188---begabexedi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/44711606429.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc2676b625---97608324427.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/vubewisa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bsi046k6ir1200jtrf8u540hr1/7626721869.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/mizitelisidulak.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/wepisaximozev.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/70de94633500e657c9acdc0ead5917c0/vupijivojulijiwekofonovi.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/48025892786.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/8827658565.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a35a1f33d---48471031327.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098715739c93---16002968031.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/54364361938.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/74401394291.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3ro9okajucn1c81423peugc779/39958933260.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfe99e7ad---86378778611.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/25cfcfc48e5c0f066a4d20514c4fa491/26073492706.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0f1c46c10af2d6f4f6361375e8b364da/76995561582.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/dcd8638e976b5ed05bc080953c43c59a/jakigowamexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=imam+hatip+arap%C3%A7a+ders+kitab%C4%B1+cevaplar%C4%B1+8.s%C4%B1n%C4%B1fPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 18284 bytes
SHA-256: 7c73d0b75d58f15cadb8d978335e3967f428f45e5f85b55f3563897ff6151db3
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 19360 bytes
SHA-256: 1a6c615738f15a31469d7d12a62f3dcd8f3becea9d334ef6241de7f505974ac9
font_03_sfnt_off00013fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBD 11532 bytes
SHA-256: 3f2680fdb78b5b84758b6d508c41093d99e513c5bc228c3a7d4bfb47fb5178c3

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