Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b8dceab685f054…

MALICIOUS

PDF

85.3 KB Created: 2021-08-24 04:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3d3ad3a252791d6a0832ffb60e989ea SHA-1: 66c93fd26259f060b34e6f2b69c07ebcf98c28b3 SHA-256: b4b8dceab685f054e79d1509da02ffedd1d85db2144a5617f1b2cc4c60fb1b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic findings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=free+pets+in+adopt+me+real PDF link annotation
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b12fe5640c97d9c6edbfeba5dd6f82a9/61323592043.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/883e28a06ad57ce96ff9a318ebc77a05/47903286794.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/12954795226.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77ce48b77---17003982474.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/87248707507.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/uef830u1al5a256a4h6qhuvgp4/31951341317.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/buleviku.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d73426eb4342b795d99846f3566c0618/23590423260.pdfIn PDF document text
    • http://rajakedua.com/contents//files/20388380891.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/45008731080.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7e87d01784327ef230238df702c29f57/5914542082.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/texuzibirobitorigavepunag.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-13/20210713074455140197.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160855f1b7ecf7---88916690920.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/xenotajomo.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/gujamumiwabudizilifemexe.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/2549916466.pdfIn PDF document text
    • http://kleiberit.ru/files/file/bidowikitur.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/suzabafuvifovitidujomamab.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/16350898957.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef75b85f3d---81938135426.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160981ce0055a1---44579380132.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/84590554964.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/265716533f92778243b47c05a316cb2a/zivejowovinawimiramaroje.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/46695358788.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_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 10528 bytes
SHA-256: 972b7eca6cdba4c2db5604a2ce9111cddfc74e0f6e6e59edb8b8f3630d568cd9
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 16916 bytes
SHA-256: 93fe8a2f8849d5ee754402b0b28517daeec214a2eca1b825ed10fc03328fdf80

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