Malicious PDF — malware analysis report

Static analysis result for SHA-256 f955dd346e20aa2d…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 02:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d252eed9c9b15a52b6d0feb2fdedf2f4 SHA-1: 56de54d8e8ebf57d05df3f087e0bc65b3d7790d3 SHA-256: f955dd346e20aa2d1930822ad9d07ea586dfbf4dcbaf57d187557f8f1df5619c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to compromised WordPress sites, designed to redirect users to malicious content. The PDF's structure suggests it functions as a link farm, likely to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=batas+normal+tekanan+darah+pdf PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/713eb7b58ea1d26cb2883736fbd62012/purevepubuginokeguf.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/19746729352.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/85897713945.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/88984527754.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6g5lcheon9vqkgc9a12kuujq84/voratotejev.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0d3bde185c0019db3983743b38a28abe/3960176159.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zomamakapipevizeton.pdfIn PDF document text
    • http://julianina.de/upload/file/91153558312.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/zurupifimapikeleko.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f750c1ad---37698616389.pdfIn PDF document text
    • http://abpaluso.com/upload/file/80027900770.pdfIn PDF document text
    • http://starma.pl/files/file/wikawegepimod.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/keboxodivejazekokizexezig.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wediwitalesupubibo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kilufi.pdfIn PDF document text
    • https://lasanisports.com/files/lagidasadejezovabulewu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/22e2adb9a61260bec62fd2b3b0e7516a/68870351399.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/saketopegorifawogowov.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lqu9pm9si04cnrf3ukq852d4f3/bizibobomof.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/o21e2va51n073446npmn07b6v4/serurona.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f9c1085f36fb97094372f74b296e62eb/22585831153.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d90fbd32fcdf937fa563f42e85f14081/jewelegigogefelijaral.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/9899572117.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/mopugisab.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_off0000c257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 16468 bytes
SHA-256: 8a49d043c493bf2fbb1f92d2784b91b43644df9c3cc304881d8c88590b0e992c
font_02_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 10816 bytes
SHA-256: 79beb89310fad827340f0c5889d91ea94e252ce088f7b3e39a3a37d8acae2665

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