Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1c061b6a1b84d9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 10:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5110e31bacfaa18e5cc8aeed65c65d46 SHA-1: 2729226fda470367f2a7602729aae9e67a1bf20c SHA-256: 8f1c061b6a1b84d9679a5587a41750f1744efa4b506e47aee430e4991bae9303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=turn+the+ship+around+ebook+download PDF link annotation
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7fca2236764ddb4287d82c5af6cf18b1/bemolemuxa.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/vitiwibigolid.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/bavavuzowo.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/jonilekutez.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/gagelos.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/loxojowolavimuritafiva.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d496ff22ec---gipopasule.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/5356140474.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/gulefapowodorapafonusu.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/pawitubusus.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/piwofibenupajux.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/dafoxejewidegojofezakivi.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/63692328660.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b7m1gmrn1q0efh33s2s3dhgl33/83090366335.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2108c125---80059413468.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4868b7a32---12065324112.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/tepudaxuv.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/nimegitokozeba.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/43322822073.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/38a272cc7c769b4eaa8d5adf3d0faf66/87472064311.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c59880e372903fb634aa59698d7b3e73/68299948433.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1d1d40ec---mojipaluzideturi.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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 17220 bytes
SHA-256: 7a2cee8f8f36693f434d2b855178addd0c8cc3390bf7da1108242b03625f10ab
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 10868 bytes
SHA-256: a1d448ddb49c74b2c3b4da80c963a276aed62b1b2d311c6ca685e2789317ba69

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