Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f0a80c1f2a2097…

MALICIOUS

PDF

88.2 KB Created: 2021-06-14 05:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 08dc593ab579141d7552e49e5f6ae4a4 SHA-1: bd1fcbdaf76eb19631fbef1e9f5e7d4a74bffe3a SHA-256: a1f0a80c1f2a2097251bd7e5a0a8516bb4fac1f6e9572902ffb1ff9ae1a7f56f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, designed to appear as software download locations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document instructs the user to open a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=winrar+new+version+64+bit PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34fce16d8---gigamemuxiluvizawegiz.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4ce641fc7e12ee11b60b978797c54a8b/zuxewadasubisuberim.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/gufumav.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/dedexobumofasaxu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d6b59d31---71400593519.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m4t6alkl17ulla97iit3gqe9hv/75683665073.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/429a793d0fe65670f7bd598f91fb4d17/50408369581.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/41684439699.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bpcv5g6v721ief2k7e0qa8n86q/wobujogizowejinaza.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160748a8dcf7b5---37190985102.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zekuwaba.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/turenodejosaxese.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/xabor.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b2796ce43ea4c5bd4709aa2d66dfd967/19605277026.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f0190190146b1405a372b298656f674e/dusudujoluwevabeputevu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/koguxexoror.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fffd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFFD 15712 bytes
SHA-256: 405478657146197704993e6c69f88d67d832a07dcbd0b6a39660d7cfaffe66e0
font_00_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 5196 bytes
SHA-256: de363ba179d7e6a6eeb243958e219f2c27c7fdb156b69a13046c209037eecc51
font_02_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 11532 bytes
SHA-256: 267d8389a3e7ca8f0f15a8ed54fd7337e8306c8fbeeef1ff4474317eee7817e8

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