Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4d9785f8911083…

MALICIOUS

PDF

73.5 KB Created: 2021-06-28 13:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7e4fa13ba252fbe95be677a9d41fd0da SHA-1: 526f1b7efe7464a0ff8e756787358fee9086f69c SHA-256: 4a4d9785f89110839682f6808da18d187004a41806423dd11475ea7e73d49b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it is a link farm pointing to compromised WordPress sites. The embedded URLs and the nature of the heuristics suggest the PDF's primary purpose is to redirect users to malicious or phishing content hosted on these compromised sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=blew+meaning+in+bengali PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9c70db30---notibumobunibiminukanore.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/fanokomosopikaxatode.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608766cd74216---51330596979.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/11668183482.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2131d0783---12776261824.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072264277943---43550573833.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/93920358031.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/vilan.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad931bb6c1c---xokiduzemotovasu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d007e4258---fifisodenu.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/2219498791.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2k36vi07ethpeq8holn0jsfi69/19665819590.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/46ae2d09a5c9cb72ff2b1626675318fe/41623314210.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/14640200319.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/81834555602.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c617df14400---99148070420.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/20976999676.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210531_230125.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a146aad8a1e---94796757063.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/92409154208.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/75886588638.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/79n4i47b4pgmhe2fmq3j8crf58/gefaxizobizuvex.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/padujobukuxivixiw.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_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 18148 bytes
SHA-256: 76efca5caa45913b389982ffcd93ba8e8ecbaf9bf9d985d0855aab3ce03a1afa
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10244 bytes
SHA-256: 55cc6f95bc67578b3290573256b840897bf1e1fe9e9be69a29e237a413a4aeaa
font_02_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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