Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b59650079493e9…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 05:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27d8073d21e251eaddb77408a2402d1f SHA-1: 9ec287b085ee8bb663f8c126b900f2e39bf83dae SHA-256: 55b59650079493e96bc97bf458616c69e817f28e61bbff137275f769b88f5daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize a link farm structure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=angle+between+two+lines+pdf PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb46094137---76452492966.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/14303158518.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/bop3t0u15no6usmihd3ufit5bg/baxalusaxotat.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/60026440571.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/34511073491.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/3622783095.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/29059752354.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72932cb7ae---jezojap.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/zepen.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd879e45d22---dedafowosoverofojizurov.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/97432124795.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/22035968785.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/f338cm3ghcfadojpme9eq5ujrm/25048213011.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/78736694349.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/vivan.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/44725927180.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/59968631449.pdfIn PDF document text
    • http://onelove.cz/file/67955173108.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/29467117503.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/80897855049.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0525a4d9e7---89837270571.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/kopuvoj.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/62487222383.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/mk1hjcg9koq9f2o0nk3q52tsu6/53688771488.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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 19396 bytes
SHA-256: a7856753b6fc28e09ab1b92bac4d8359c9c4001dbecdd8b853f93ee156421cec
font_01_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 10620 bytes
SHA-256: 4a3fb86015b29591c96f3e3cad7ad829f064eb05c1cb03ba13bf105fe42db6b2
font_02_sfnt_off00012e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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