Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56007351ab4e187…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 21:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84f76e46c43818775f323650eba17097 SHA-1: 2d8d6d8de707af4130f322c2c105354c04a46956 SHA-256: a56007351ab4e1870effb0c7f234036b6cf2eff7504015f6afb1d194f2d044d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1bf64819775b1528d7618a5702f02529/59732654019.pdf In PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/2a6127f7e94a1583322e2fab0914d107/45183691911.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4e46520c6bfc36131472947289e81886/12293199059.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/65955111940.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f28a330fa3c9dde7228efe37149282c/41559457728.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/sefixubesalozur.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/36784199333.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/woxesadepubobugosalajeser.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5a06dce4f0a761b9bdcd3c7934d43c1a/40468361888.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/zuzowoxemorasel.pdfIn PDF document text
    • http://dzbnf.com/upload/file///74313509845.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9s4ef2afo370n9i8ocp5c81667/nawegefexotone.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/sevikajixaragiketevazobe.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210719142058_4oue0x.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-7/20210707030812921786.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/vilokedikexovun.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/zafemirinononege.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/90714073980.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e385ca393d2---dafatikurikivimogamosak.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/8omi8iseff8gjvsfs5d8go8rp1/4496242066.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf24544bfa4---zeborox.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0377b5d15e---94604215837.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/46486128923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=weeny+free+pdf+password+remover+%E5%85%8D%E5%AE%89%E8%A3%9DPDF 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_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 21772 bytes
SHA-256: e8b85589ce7d05a0dc2f87c0f8078f5c02cc582364762dad2ff2c342b1765085
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 2192 bytes
SHA-256: e64fcd345705f7b09383ea89d03cad7d7aa2fccf1ec4e02aafc081ae9bb5575c
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10684 bytes
SHA-256: 3e713fb13999823687f632075b6933bd83689ecca5a637b57bf8d4adb8f744b3
font_03_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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