Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13d7b004b153972…

MALICIOUS

PDF

74.4 KB Created: 2021-08-28 08:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c8c59406b54f0ac83e63a21a9f3c8196 SHA-1: 893badf62cbbf71abddfb0e0072e802b332bc1f3 SHA-256: b13d7b004b1539722831b434ee24f43208054cb617dd8e5e8023709799a95eac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=the+perfect+wife+jessie PDF link annotation
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0edca0da341c4553ae35f1037e1d9545/31407957731.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c918b4d9dbd---damegojaretozogokisasolez.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b4c9146673ee572da104bdee9f705ba0/tamoxopevo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/88625913266.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/32613368214.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160769baa82218---fuburu.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/nulofibelefubew.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/25671774501.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/114vo5b5tsvgiqd42clpbs44t4/19606923153.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3c69b3905---diwotenemudaru.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5b9159cbaacecaca1b9a5c522ffd0566/limebonuvutifatemawoga.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/dekapumumoketasarikipog.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/rugonolabunulodiv.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/75327376921.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/j55uljubilfm5to7s2c1bdjkv0/ribamejebafewajodive.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/25bf10380dad60df7a0d1d8b1472f8ea/kebolemelakizaxenojap.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/76791648123.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/guvuxetizor.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/5643935776.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6813d98cac---11438017224.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/90313049465.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cf970246258e3d1719bffdf9730d4322/xenolamedavokel.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zefufojosakojefi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC355 10324 bytes
SHA-256: b87c42b1c77de83556603d795b1f2b1ff5aa12c7d4a1c07a04d00d1848f7f4da
font_01_sfnt_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 15896 bytes
SHA-256: 46f3e65893b94bef485889fade36447740267eb73ad663edd372ed696ab100a0

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