Malicious PDF — malware analysis report

Static analysis result for SHA-256 1089b85cef52779b…

MALICIOUS

PDF

88.1 KB Created: 2021-08-07 17:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 944e853776f082985d0a9d5fde5312ed SHA-1: 763ee154aa5524669ddc3b1a6139d231aaf16224 SHA-256: 1089b85cef52779b8b09dc4b9a4630b1d06a05a6fd4d0d5bd6a08ce940e48cf9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. ClamAV detection and ML classification confirm the malicious nature, likely involving the distribution of further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://krisoc.ru/uplcv?utm_term=dk+goel+accountancy+class+11+solutions+financial+statements+with+adjustments PDF link annotation
    • http://pescepiana.eu/userfiles/files/lanilez.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/27796864657.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/24059643088.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ab6db7b33707780eba224b13f368a5b2/9339881544.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/26db0327fb043332f3e1ff9193e0ef14/46413295598.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r04sjcu01dm1dl0bfqpdnn8v44/93416593260.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/lexasetasepevo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a5f5a32a---desuru.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074320b135bb---gefipetenebetusi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0354i2uc263euo1lnv7kkma2g1/79576657421.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/jutilakibafo.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/xaramozovizujebufodise.pdfIn PDF document text
    • http://vinmexindia.com/uploads/54958670939.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08cd74fc57---lodowusatekumewapat.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b4c105fc5b3c203da5250260e386b816/81761604394.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/11594467659.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3e767f19b997bfcc759a797f74853094/basev.pdfIn PDF document text
    • https://soechi.net/userfiles/file/68142225171.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/62643843896.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/17739884461.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/19820368387.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210727_230157.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/86590759279.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/novumurukudeg.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_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16396 bytes
SHA-256: 0c3e6e008559bd8b25fb2e802e20a2a25f7bcf0df84fadcce77a204c36333787
font_02_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 11396 bytes
SHA-256: 1d011883d4233dc36bc732d7aa1676a39cd34f5c6550a8ff13edd51343aff462

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