Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f142efab6514594…

MALICIOUS

PDF

93.8 KB Created: 2021-09-18 12:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37967520ab70ed199c79ebeb4a9a71fd SHA-1: 8343395216cc79d61ac926393e432c2e7a44e42f SHA-256: 2f142efab6514594ab077b8a68fa9cbd8120b963ba390e888f3652d15d6d1402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://garglob.ru/uplcv?utm_term=tai+game+cho+apk PDF link annotation
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cdc563bb14b18128d4400a3fc628516/29902274071.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161402c927d496---tepewenadedasaviwover.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/zuxiven.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/37488786663.pdfIn PDF document text
    • http://gewald.ru/content/Files/wiwosiduvuj.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/29550775430.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ngrond57546v9uqdr7f65jt8vs/13305602895.pdfIn PDF document text
    • http://lse.hu/userfiles/file/lukave.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/bafesitujekaxugif.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/q8pdatfre4ut55tehboc0lqng7/84803663808.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/doxotukosikiligesimopatu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977d513ef4---14440062218.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/novefikojudajawuw.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/pumavuji.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/befidupi.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/mutepanuvaj.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qm124vf08qrhqqteut69vlco25/varobesarafevif.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/74043709475.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/venomanimi.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/jumigebajojo.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e95e8826ad6982ceea348a449972b0d0/16539944650.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317b65c4c05---xisosawi.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/relufipu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 24408 bytes
SHA-256: 49ebfe855d246f618b99cb41af55de472c6102fbcd73810a6e9f9d35b0d22f31
font_01_sfnt_off000130a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A5 10360 bytes
SHA-256: c07b54003c6719a93ca538f8244f81956de6cf1293e4c4de4fc78a411639c54b
font_02_sfnt_off0001480b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480B 1888 bytes
SHA-256: ea6fc89f0fe356b2e7eba811b22522bfab26d2ce779b6fe03ede2b77726cc158
font_03_sfnt_off000150df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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