Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dc046dec5e97c9…

MALICIOUS

PDF

76.0 KB Created: 2021-07-15 11:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd0b686374a26c4299178a32b5099533 SHA-1: a85eb76d7e7dc43b52af3a70491629dbbad4f80b SHA-256: 17dc046dec5e97c9f99e111a19b2f3adb563c7aa0bbf000e6ce2965619b4dfd0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and a callback phishing lure, attempting to trick users into calling a fraudulent number. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many hosted on compromised or disposable domains, points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://blindnow.com/userfiles/file/45461259904.pdf In PDF document text
    • https://ozmutludokum.com/userfiles/file/13027919018.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1cdf172bc4960addc7be0435903bfebd/nipuxa.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/83655211957.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210506084659.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/0418cea61a650192fd03b75672190743/16400074288.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/veludova.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/90f3842ff27858643e8bb19ea3a5a4e5/74494029497.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/e0vd4h50rggt38mb5mvoir223d/58107080897.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/44338958876.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/12363003862.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/doxomok.pdfIn PDF document text
    • http://faradbox.pl/files/file/22530701474.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/mutosovije.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fejigugotomeveminafiwu.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/41269812084.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34cabb6ed---40575754391.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/kepedebabu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d1c8ae37cc543503e26a9609b395d5ad/9565891440.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4d056a30c78126f0b335ed2257de2e3b/domokovizebogelefik.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c992eaf26b5---80044278427.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4329i7arjrdd8gtjl4hg6ip8t8/93694040073.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/32267972133.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106100207498996.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b754626664ed3ee6d95adafd5777b3d8/90227726712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sky+above+earth+below+peace+within+quotesPDF 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_off0000c38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 16960 bytes
SHA-256: f75b8ab5a93bb4355bad26e8638fb5c4fc37c72dabf7f3e24a6e0d8ff9884b6a
font_02_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 11292 bytes
SHA-256: 0239b78f2e0f179be2d384f58403a9c4af35fa2ea64fd2ef46fbf54662cc3382