Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a16f78a2cd5258…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 03:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b16454cf1aa1710c5ff17efd0d6cdf76 SHA-1: 099ad0976cde83b1a7221b57a1fe7928dbff703a SHA-256: e5a16f78a2cd5258979923c2ec38f0a6aa6b9311521506b1a7e38518d35bf849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document's purpose is to act as a link farm. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=how+do+you+make+whipped+topping PDF link annotation
    • https://oncetrabzon.com/resimler/files/domav.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/79fb5a80400337c67aa13950dab9a37a/nibusuzutavobu.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/86785210498.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/kisubipepuf.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/jugorapa.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/85340477612.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vijefisiseforafutapovo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160951fe0a17b3---weropobibalu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d07332ae1eebc36fe50b23a3a6f90eda/romabedibijajetax.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/xilopi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a529f8e0894b9aa96572ea3c5ddd954d/87832340837.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/1610698440.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/56d61071a9be7c025988ba1c8fae5008/59066785123.pdfIn PDF document text
    • http://rochesteradams75.com/clients/7/77/774a1ed2e17b5a3c8fe4214cc08eab78/File/70876902446.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b3057c06409b3b275ba2eb9f77701655/xiwujijomovini.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/5f00deead6b2ee322928e4ae0f30616e/18800620186.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/84863542239.pdfIn PDF document text
    • https://grouptm2.com/contents//files/datideki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de8ce07fbe---duwowolani.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/4666187611.pdfIn PDF document text
    • http://cwesp.biz/upload/file/19662043079.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gr0tf59iujd6lr9lth13vck5lg/99437534057.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 10908 bytes
SHA-256: 4d8dc94dc7df373870fc8d6b2661ddb0bf7405867bf5472a017dd8b774f8e5bb
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 19612 bytes
SHA-256: 0db03941cf454aaf8f78bdaefd0794617623d93ab6ce303c6f938b41f2491920
font_02_sfnt_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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