Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c9cf507900850f…

MALICIOUS

PDF

86.2 KB Created: 2021-08-21 03:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5535d80bd19dee8ee6b90be6091c79a3 SHA-1: 112b0730132661178d445ae7ea222002642eb7db SHA-256: 31c9cf507900850f44fb031960066bb1179e99b54a3aae4a6678d2da1bb67946
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised or disposable domains. This suggests an attempt to lure users to malicious sites, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://anmoul.com/userfiles/file/45073878399.pdf In PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210618095442.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6ac59f5e241d248f26a39d6891af0b47/wizodexijotimujubunix.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/larujesodibanunedenenedej.pdfIn PDF document text
    • https://ancoraeducacion.com/images/febuganizetelaxipubezunod.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/37690020869.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210603_406EAAF16DB48EF7.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/dipusipukofoxareruz.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/51921468367.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/64653765176.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/815e4fc1f941e1f6af72ad7e4ac12343/nuzalokubabi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f9bfbce78---nunefokem.pdfIn PDF document text
    • https://fong-cai.com/upload/files/povebo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/zinuvotikozite.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poduwijisokibodaredag.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/fivinawofudesurelo.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/76714441391.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b7dc8c4ffa51031288b542817a037c80/fovade.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/66581177523.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/51879872071.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e2a133aff---tuvikitonawur.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/10nt8iisqp31ghn345g635d5n4/13650198771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+calculate+voltage+drop+across+resistor+in+parallelPDF 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_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 10932 bytes
SHA-256: 9578244aea205f1a309d35f42eaf6ea161fdf85a6b8598cca2c33368e5918f82
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 17140 bytes
SHA-256: 08cb1979adec19282994f7458beea5974dea261bcb13e8119efdec55198d95e8
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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