Malicious PDF — malware analysis report

Static analysis result for SHA-256 de84fa185f502e48…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 23:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1dea0fe349863d08cb9f4fa4e0fc76cf SHA-1: 1fbd3d0b22cd096f205a6657827afc58719d8213 SHA-256: de84fa185f502e48ef6fddaf010712a521d579fdf833799e434a815468665cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://drafthe.ru/uplcv?utm_term=interview+kaise+de+in+english PDF link annotation
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/1912f206ebc0481f98e490dc0949a4d4/27191569762.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/tewabewalubefowixokamuda.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/92976375309.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/t0u449vhjj4ioql3hdcao2pfk6/voziwisofejelisexanagimom.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210623030443.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/diperuligorezuvixajugar.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/suetipgesknpq27vjv0ccbf5t6/80510435795.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723fee04f54---bazarizipizobenuj.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/6120135928.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd5da67c7---kenagatekurefomam.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1307e49a---kebuvosizawuj.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/944e72c3d28e6aead909ee1230c98771/92347708036.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e18e65573---jufedigevurubapetaroz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ef0e8808a25325cc28bf2d129590baec/dabebexerewefitive.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/53348870091.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76157bb77---zovofakamapepugoxu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087fea6256ba---vobowafotovulep.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c1413a9c6f4eafa55982ae7237012cd4/40282489083.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8dd43b8d3---jukoluvekumibugejo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d084f218064---32000984529.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/tezoj.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d574ae13ab---xebanuxoxavogetexule.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ti1j7appuqit6qj4h6i173eeki/besuvivuxixofowejo.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/rukijuxepexivukeg.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_off00011535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11535 10600 bytes
SHA-256: d6027ce479dd03a0dc231c5d210251b413cabfbab7f0a05680f335fce0e24c67
font_01_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 17008 bytes
SHA-256: 829c6996c8e7a0a0c65fd0d0d70f137b80df111548f61c12b0a891d696d73dc1
font_02_sfnt_off0001593f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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