Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8542072e40f415…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 07:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7959de3ebea9ceaa3b977c6054d22ac2 SHA-1: a4ae90a94aa5cf877ca8fe412128d42d5d7326dd SHA-256: 0b8542072e40f415b91ee199929882a8d1a8f1749875aab4fb63be521dfbae7b
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 Pdf.Phishing.Trojan. The document contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary attack pattern involves directing users to these external sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=write+375+as+a+product+of+prime+factors+give+your+answer+in+index+form PDF link annotation
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ff391e7c0a32ed06492448ad06f6143/xuwurekaxufenoze.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/adf95c347a242ee62defeac83bd7e572/40006963073.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/kefizev.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c49f10c1731---10422492730.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da2aafa3287---xalobexujavijimiluwap.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wixomolamakinakufuza.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/18fe2debb1039d486847745cfe7ec8c4/81544884440.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/85911720638.pdfIn PDF document text
    • http://kasargod.net/uploads/file/29840679602.pdfIn PDF document text
    • https://pellevah.com/upload/files/25072301108.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2560c1fe0---81791256000.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/51pdk89uh1e9rdipbkniiuvgm6/vifotuzudinozibi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085627d13726---59372900959.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/59u3kod6n5rik6oorh0b7mbrfo/50039908372.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/56821080159.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/musaxotowokanun.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0f1c6e67ab1dcb6970d1da34e2058e8c/paxujexuvinegaf.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e2d75cf0f1746c0565293471f8e972e5/livav.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rizuvuwemifuzuzus.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16072c67e56563---tupepeg.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8533271cb---27880970307.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/80889355604.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/fodagarugebomuragenabi.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_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 11732 bytes
SHA-256: d98b5ed2343db6719a31b517394a7bb954c0032854947d0984df2cd58014a8ac
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 16076 bytes
SHA-256: 46535fcb05a0d33409f0d45513042490f164fe30cc1a067f156937a053c092b4

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