Malicious PDF — malware analysis report

Static analysis result for SHA-256 e183e7cb4475091a…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 22:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f764d80cf201c5b64cb55b17ca1a4c85 SHA-1: afe3c72d770e905561d4698f2d8605f88880be39 SHA-256: e183e7cb4475091a149d9bfde3d7f00454aafbdaedd1009ece9eda5b06d8856b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the presence of external links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ever-pioneer.com/upload/files/76260138270.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/71d967e970859a234d7df1b63e0f23e0/patitusixewuxeri.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77e872e76---29189055293.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/kolowilobogepimetumoxede.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af70ba4736a---83700587866.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607905c34f7fb---judir.pdfIn PDF document text
    • https://efnnma.org/files/file/fepedafiri.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/2766670612.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9105f174b---fikexewupozege.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/66dfd7e9092617e7f7a3ac1a7a18f10b/39425348210.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/64370499613.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2cdda6c1df1c6811a819ab3b2edce04/bebud.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/23jrn3cumln0rljn59ckj6tb2n/22021254056.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9301a72cd---83549216335.pdfIn PDF document text
    • https://stopserv.ru/files/file/xepomevelixugadatefugonan.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/dimaxosalunigusaranoki.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7ed382cb---82613280724.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0c7f420a---19049749539.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/narez.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b03cfe8eeee---gusitiwolexivosutorop.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/uht021es314g5ive1jmf8hejv2/75706901712.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/leaj0oqg4mplo9isvl4oljfm15/bizuzofugobijana.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae54f13a0e8---zufusadujakenuderolisuwil.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/hbhij4mubtgs5dlhn065881iib/32578569652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+judgement+card+reversedPDF 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_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 10816 bytes
SHA-256: 95a26a402c16c1bd6b75f02b9aff8c8f36eae1044c228373c03b6f2709df762b
font_01_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 16020 bytes
SHA-256: e3d188f4b04ad5ed392f00b21ffd612818f0f63e1bbd6619fdabd8d03d673f0c
font_02_sfnt_off00012b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1