Malicious PDF — malware analysis report

Static analysis result for SHA-256 2935556ce2ec0126…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 00:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9b8c2d48722f793215729368a760e4a SHA-1: ed9e7fd4bf6010d75dfd570cbc48d32ddaa7152d SHA-256: 2935556ce2ec01262732ab56a679aafe07cd4eb939d1ead2947cd518381600af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic points towards an attack pattern focused on redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=difference+between+data+link+layer+and+physical+layer PDF link annotation
    • http://agisinfo.ru/uploads/content/files/74566690812.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6b8de073f4b0430b593324cafaa2ed50/pavidur.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/89856284220.pdfPDF link annotation
    • https://sahodayabbsr.com/test/fckeditor/file/wulinijixepisukopidajabaz.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/81390049526.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/20291368999.pdfIn PDF document text
    • https://birudongker.com/contents/files/70315058217.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/91864059864.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/defoli.pdfIn PDF document text
    • http://wych123.com/upload/files/xozebisovodugakuvo.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/45667497313.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/gikumixapulunudakamog.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/jalokotibugije.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/15355064257.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/14274075793.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/98812002841.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/mopewaruru.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/8765376808.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/bilenewexopuzomemoduk.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a34802b0fef79875745d7611ef1fbf14/12434844630.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/kexizurenabi.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/16223450122.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d80ddee85---paxudanim.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/10175086089.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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 16864 bytes
SHA-256: ca7df5ca99b7c6727b67994c5b07aeb00e33fe41534ced666d0b6dd3d47bec38
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 11032 bytes
SHA-256: 86af138dd42bce894fe02ec6940d0d00952c1a1ff8b89d7da41de348572b8cce
font_02_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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