Malicious PDF — malware analysis report

Static analysis result for SHA-256 4382a861c9218602…

MALICIOUS

PDF

91.8 KB Created: 2021-09-01 05:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9174eda9f8ebd8c1af292345567a4f70 SHA-1: 15c44e052cdb8be8ba7acf8d62bdc79cff8a796c SHA-256: 4382a861c9218602cbdaa428cf41990f2f5a186c6ab11ebc4cf1ad573ee947c4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number under the guise of a billing or security issue. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://vhktn.at/images/content/files/jebelixalibefi.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ec24722a9---79800959044.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b2d35231---32603679452.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/10413744926.pdfIn PDF document text
    • https://fivetc.net/uploads/files/tikepadivuzigitegaro.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/68090029734.pdfIn PDF document text
    • http://regmac.net/userfiles/files/34007334554.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/vabuwudavobewudotadodoziv.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c3cc2bcb---koxojibegerizovur.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/29387671379.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210612121947.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/k9p3no055akhsteq0g0kiq2hhj/wuxudoruwak.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/biduwesajawawerosavew.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a173235512d---68546592974.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/12194671113.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/juvunupexaxiguvexuwe.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/58597310882.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f9c0cc2a---35409749653.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0c440e9e---70980628458.pdfIn PDF document text
    • http://sam-global.info/files/file/pulifaw.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/3074314990.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/36889526450.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210820_27433C5A4AEDE2E2.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/loresolimonelovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+were+victorian+dresses+made+ofPDF 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://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_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 18252 bytes
SHA-256: 2942559442751d3efb62d5b6fbaa0b15bacaa37f3df436967b2c4df06d7e8b2a
font_01_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14809 10840 bytes
SHA-256: ddf2113309b2a95df2bcfdaba93c11897bd41f4772a6aec7c7234aab9c23e920

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