Malicious PDF — malware analysis report

Static analysis result for SHA-256 35024654eb26dcd1…

MALICIOUS

PDF

96.9 KB Created: 2021-09-20 00:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 510751e41d6e826a5de9dd717dc40ebc SHA-1: 0bd7a066415d69df47cf81ce1764b66de1a07c5b SHA-256: 35024654eb26dcd108d98cb23f98b684f789739e545c128dff00495a30076d5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=como+jogar+pokemon+no+celular+android PDF link annotation
    • http://nontaromclinic.com/ckfinder/userfiles/files/67066012089.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/nixewedagejoxinojama.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/38360288618.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/kupupob.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///91198751557.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/18340409294.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161430408f1637---dewexemarolodifisoja.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/83739792789.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/71694976035.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202191315477853.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/nizukibusipovu.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/futaxelunilejuwexegeg.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/33931734888.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141748107820---sirebokevigaxuwamitomu.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/45223908544.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9c2fb57ddebcb6642f95115df9a9fddb/tisogupowaseseli.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/figiribupewileraje.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/37994921878.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/28894792700.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5438cc15---tevovuzefakevagobixup.pdfIn PDF document text
    • http://retailcop.ca/files/nofenowovuv.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3b3214eb5265742f96f55e1f9cdc895d/78644621944.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/jedisujomam.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/82998971398.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_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 21512 bytes
SHA-256: 9d56ee511e20b9ae00b82f2fa6a858077adc2db4f762882bf174835268560804
font_02_sfnt_off00015aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEF 10944 bytes
SHA-256: d3ad345983101143959db3905eca41c08dbd6292f1a2b4a169edd25cea21d7cb