Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ba1bcff20e0fe3…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 02:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7b59552bc14edc0bd7f5edce3dab538 SHA-1: 529f668e682d84d65fcc64ca3a1b752d0790cc2c SHA-256: 91ba1bcff20e0fe390190cfac66af2f1ad51c4db30e26c22ce3a396602cb9711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites hosting PDF files. These URLs are likely used to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160894d022b8eb---ninemil.pdf In PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/sn055nmoe2r6droh7sp6pev6ou/lisekelatopo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073034d7b11f---buzoxolilukarori.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3d1153ed---zafan.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608399e496a15---36446015340.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6fefbba6784bb7437bc1c04101a938cf/lukapexuwul.pdfIn PDF document text
    • https://computerzone.pk/file/rokuz.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/20021048518.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/5671471038.pdfIn PDF document text
    • http://elpijisystem.com/file/13373737930.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/55687892674.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed449eb810---zijoxoxewe.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210617_09DC334440585F21.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d7860275d3273972220960b653c1ee4/40572623472.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fu4a8bbr69j2dic7l6keigh4l4/rofare.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/jimuberibajonerosi.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/49140921543.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/32086735878.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/72255753982.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lorejuvepugijezo.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/23555780954.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7f6d09508d2ddccf0d1c1f2ec96d296e/38027842184.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/31f9499de02d0c181303e7ba67237a3b/12288865928.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075961ce8c42---92512381579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=modal+auxiliary+obligationPDF 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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10572 bytes
SHA-256: 998b22d44b445e555444af6d856f5515492980c6572d03a03bc68f2bf162d73c
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 20972 bytes
SHA-256: ee65ab7ecea4e4ebfa432f9cc021b4edf9ad3ae6627d2eeed4d05d97765feb07

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