Malicious PDF — malware analysis report

Static analysis result for SHA-256 231a06c3771abec5…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 16:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7782ff349cfaaa3820d684e34118afb6 SHA-1: 2d25b5e607063ac0c9e7dab5d222e0a59daec8f9 SHA-256: 231a06c3771abec5a91d6e68c88cbb6edb85185d3bf183c2d8c04ebeabe4be56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=real+racing+3+full+unlocked+apk PDF link annotation
    • http://masonhn.com/d/files/62833958255.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/59005616483.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/95219061440.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/n4blmj5s88q610208hreooklkf/97620512131.pdfIn PDF document text
    • http://slovoveri.org/userfiles/fefekozozamerox.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-10/20210910194428359129.pdfIn PDF document text
    • https://mbbs.hr/files/14275503056.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m4hha05e6k559elio4ost2k2or/31852349113.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16130e84fa5258---64601969774.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec088c441b---79404271168.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/94511773292.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/dafekanutumezuse.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/6558655502.pdfIn PDF document text
    • http://coffee33.ru/archive/file/56942724181.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/74629722232.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137eadd790e5---78328926077.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16314804430836a198b6174eecf02c.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1026c1f02---juvasobamituzomamevixi.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/kalonifevugufal.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/60806001527.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xumobu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136c46a27f06---zilulidijevomodom.pdfIn PDF document text
    • http://isvpro.com/custom/files/medifigixedetapojado.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/wotam.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256af12509---92152911779.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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 10940 bytes
SHA-256: 81641288bc96e31ed9fc00d41b8b092552095294170a73cbbfae677330ee98f3
font_01_sfnt_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 17544 bytes
SHA-256: 007b502d25a127e29af672e677ed6b802af51bbe26fdf4f10fedf33302e8bbd6
font_02_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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