Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c20180b3536deb4…

MALICIOUS

PDF

103.6 KB Created: 2021-09-06 03:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21096939383b15bdf0f9b61643f76235 SHA-1: d79b36b69cbc8bf94cd0f2ba69cda8fdbde8d34f SHA-256: 1c20180b3536deb48121152c5114b6760a62e4a5ea4934f290b79173a816db2f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate it's a link farm pointing to compromised WordPress upload storage and potentially disposable hosting, suggesting an attempt to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number for a fake issue. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9b11bcb49---teguruxosex.pdf In PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/fikapeladi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/28a6e2db340be9bed83aa27b9f030ff3/1950919312.pdfIn PDF document text
    • http://gibisch.org/files/files/15650172209.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/5a39e98d134e2b456d88f834660c55e7/xojetipegal.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e56a0743a---94706935214.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/15207766218.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0ecc9e6e17bc4127b0fd8acb25b98111/mufagus.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/wowurimeg.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/98349653824.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/59016205697.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/mameruwuneti.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/nodipowan.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/c0hb56okpkp1j7rl0fkelulq03/4214691731.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/73846985948.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebea3bdf15---bawiwuxu.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/44097538591.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f308e4e48---67332909056.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/34139303517.pdfIn PDF document text
    • https://uangraja.com/contents//files/22453241397.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/et76292lr00lv6bv8g6tt7lujd/49827121517.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/ronodeviworoxiwa.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/penafixuluki.pdfIn PDF document text
    • http://bamila.vn/luutru/files/7638852729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=carcassonne+scoring+pdfPDF 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_off00012c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AB 10680 bytes
SHA-256: 6cb86f3fa7d8b6b2c67cdd46bde5e3a43b07c16f116407b8ce46300f35bf9a44
font_02_sfnt_off00015d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D10 19712 bytes
SHA-256: 8dcdd5b93d39c37ba212fe6f589cca2504414906c5682860faaf8776690d7dec

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