Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c347da58d8ab05…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 18:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4829a1624f7d6ec9a5aad815af21ca8 SHA-1: 7a540052621358dd0d90088d1517bfa12785d9b2 SHA-256: a6c347da58d8ab05e9659cf161f5d5ee3ccbd1c574f532a8604722c1df2718c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=english+expression+words+pdf PDF link annotation
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e13502809fda11b5f65b2bb53ccedf53/gafewobozopuxiditalavibo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084a8c1df6cc---71134184388.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/16784222390.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0a9a42bb9888b5675e05c3c19b2781d4/xugukufaperamuwolaka.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/18558103743.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/40588885566.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f657f131053ddf7f90363d43450ed2a2/ropegap.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746751b4246---59606646337.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/94352334847.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/93656778307.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zopodadivuduxejo.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fe9d352c037b27580ba540e85b27642f/53188725739.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/94529473614.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/gozozodi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kepidenigavagatiwokegiki.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8k0j7m01sudvrp0q2qq7g6t6g3/xanusen.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/mejagabepemojazur.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/27322061970.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/36922531668.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/selinupi.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/jefojotiwakifad.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/akjt71s67bigmk0etjefpdoobm/12749056510.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/54668540953.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_off0000b790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB790 10688 bytes
SHA-256: 7968429a70d4df14ba4c1ffad21666576e2f19cda9b70e45b242a4f14228ffb0
font_01_sfnt_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 17544 bytes
SHA-256: c5612d2e205a5a51e4095010766e1823e8a3d321762832ef07fc6215c7063dea
font_02_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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