Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f744fbcbc68c980…

MALICIOUS

PDF

90.8 KB Created: 2021-07-13 02:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 499e7b1f5ac578a476566f3aef7d9de6 SHA-1: 15300732ae2d4fb38ca3833e0c1d29ea49e46469 SHA-256: 3f744fbcbc68c9801480e921c2cf2ed588591434080a815eeb330e3f46f620d8
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16077e22ed57f7---danedumoxudonofi.pdf In PDF document text
    • https://globportal.com/upload/userfiles/files/nofigakopul.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/13521007351.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rgt0mn404ut0hvvdvkmp56q9u3/zomejekekofobituxixonuzez.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/labapamogimiveronuzenewi.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vhp4tc9u5bm1ed3ftk56devjo3/ritapamimizunolewitu.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621666350.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4092c8bbb10dd39749b4e32cc220ce6/84281851422.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e668ebbc---58807923889.pdfIn PDF document text
    • https://micsys.in/userfiles/file/sigusajegurakojerowun.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b57b9186---ketivivarik.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/zuputesesumoriwemef.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c31800369c708963aa8489290daeb765/gujufezeg.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jedasidominufe.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/kilujapefivoxutiwopur.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b3f07e12---bifofegapaxelikanad.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nsk05rleosld285tc9hsh3g6m2/fenojibud.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wanelakofufibinelananaduj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76296cdbb9---75645279362.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee567bffe---84721567562.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/liguwunoremudun.pdfIn PDF document text
    • https://inifd.london/uploads/file/tigesafotolixazivogavirew.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1mrg76se6g0j1g0nlhq74t70u3/soseta.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280210152801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=examples+of+organisms+in+kingdom+protistaPDF 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_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 11016 bytes
SHA-256: 463181420e655521e3fd801753e00ac47aba979609a0742399352d18d8932e94
font_01_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 17568 bytes
SHA-256: fc36d10a552afd11a238327bcffc5341efca0168776fc9a96ed4f08110adf580

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