Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2040d33a1872c8…

MALICIOUS

PDF

77.1 KB Created: 2021-06-20 07:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: df563cd76914730598b59ed287fe1da2 SHA-1: 42d5eb92b5b235ebd42c5ccada8821933c4e802b SHA-256: 3a2040d33a1872c83283a58c95545a006f9db844eae23b5ecebc0dde196eb841
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://alkalacarservice.com/public_html/userfiles/file/dazepuwipibizelerisoma.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e49b8ada---54654003082.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/84604233186.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b49dfd25ad5d9325d261a9aa4bc60876/josulokebewi.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/doruvizuvadi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/g8f107dhvdmrmfjsokrjnk74g2/79211781752.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ef3mtaegv5jlbgb7sheken1co4/koridiv.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/spklc8jeegtpbbcdeejp8rgr9r/25751116076.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1mcihcc8j1urdqess7vmjlujj0/67125285994.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/sozibesigesogesidoka.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a42301cb58a---45164356573.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06d0e24d8b6332a916cdc0b1d6d682e9/vanogudekolubapubog.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a921c4cc29a---10360467479.pdfIn PDF document text
    • http://aps-mes.com/files/file/29617170826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=auld+lang+syne+violinPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 4848 bytes
SHA-256: c97fccc5d1112cf54e5e990edc4fbbb54b2a04b562a1ecee7a3af680e801fa3f
font_01_sfnt_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 1824 bytes
SHA-256: fc2cfd95df1cc2abd241ddfcea3bdbdaccd19c216d0b2b095f5a0ee14a508d72
font_02_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 12616 bytes
SHA-256: 7a510c71d2cc8bcbabc7e53f864832e68283a4fc1544b45876161a6a6bb83e99
font_03_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 16104 bytes
SHA-256: 471cbbdd6dfa870717fca936d57edf989f3b619d47800d59556d7daf24f82b13
font_04_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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