Malicious PDF — malware analysis report

Static analysis result for SHA-256 734c091cba464b4f…

MALICIOUS

PDF

94.6 KB Created: 2021-06-27 06:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 403d2e0551a0431a1ca3b6a6ce9f96a3 SHA-1: e8569ee6b743c1741ddc9036f56594c2758f80b0 SHA-256: 734c091cba464b4feaae0e1b3dd3d60f9856e482a251190369de95f7704de0d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a malicious PDF detected by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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=consolation+meaning+in+english PDF link annotation
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a147e3cdbc0c095669aae7acbfde850/golumagivenidiparu.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/30527117734.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc87a404b8---28644613776.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607387da7fdb6---88392486438.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e27cd8b37c4a4cb6d4d2954ea425e64e/36137370812.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/69430823696.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f524f080---55397694867.pdfIn PDF document text
    • http://texmet.pl/userimages/file/86295539838.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/7943983783.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/gitiwunokurozez.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/fpvvn6u5ss1agdgh0k00538c7l/99705116138.pdfIn PDF document text
    • http://short-story.ru/upload/file/681226283.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503035226510.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f53883e557520ab21595a8953adfe4bf/pozefupewi.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/40768278700.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa3f9eee5---ximakexigilejujedi.pdfIn PDF document text
    • http://apvn.info/userfiles/file/23701679216.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/42323760795.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf228347a---82298325253.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bbu20gbh1dmps55palc156otm2/venedemexekajamude.pdfIn PDF document text
    • http://bscartridge.com/pic/ludiwavuzajavaxujezuvik.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/24977158386.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 2348 bytes
SHA-256: 94181fe422b05c132a468e9886aa9499412ddbd9512b8e67a162e5f8acf50536
font_01_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 10488 bytes
SHA-256: eedb81a317113734c710855cbfe79346cc51c61b9c81bad70f276013e985546a
font_03_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16384 bytes
SHA-256: 7b603bc28c8e820676803dd510cbf81157a337cefef1e9d7fd86a9da794e15ae
font_04_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 22896 bytes
SHA-256: eef03b6c73ead4ddab0b1e9bdae7d897a74da1c72be17d2d508a04a954fdbc9d

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