Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf9e6866dc5ee14…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 23:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1216fbb988c1b5d54d405eb9c640e095 SHA-1: c910fbe2729be37cc41ef479ff2a84b99d5421da SHA-256: abf9e6866dc5ee1461f9c89f92ce781e3892bf2734b811ca99c9d26ef47e5bca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://strechybenesov.cz/content/48002204472.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/u2fkploq2d6d4ch0ftqhphqpnm/22376564869.pdfIn PDF document text
    • https://olterus.info/contents//files/vuvatejiwed.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ca12e126b---17676366113.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/35929818485.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/01j02l8fdbnoo2lbqns57vo0pe/virejufawokidafevo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/1e23be167146b460c8db913b8486aa51/kaxunazezufujupujewepid.pdfIn PDF document text
    • http://jestbogiem.pl/app/webroot/uploads/file/99609246472.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m1ukc04ukea54p9lc7dj6583l0/29743953801.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f4449d772---libub.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vizexasuxawexuzabujaboji.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/70181800883.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/26436353e03a299afc2f7542868a6c72/49585118017.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dab2150e1---gigukazizunipubofikoturuz.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/lexavijovedulipesulawi.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/pefawiduwaf.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68048226c---tagadalimebado.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609261de9658a---68211755899.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd2f89586---55592581331.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/8151574851.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21a152d053---zixuwefurosalogani.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d9ca51f47808b507a9341aca7fc227cf/nodofusir.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/31811353025.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887fc97b7d2---42782533920.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/31d042557e9dbed74bdf42a23a8ec012/redoneberiroxorodup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=digital+marketing+strategy+thesisPDF link annotation
    • 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_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 16856 bytes
SHA-256: 7a941bb3df7bb01fcbbe32fdaa9ecc4ba721faec589be2ec4ad78d8c31d56908
font_01_sfnt_off000119c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 10644 bytes
SHA-256: 9599584bf80cd4c1a6d4663cd964772c4ec332eb7858db67f79213e7eaf46938