Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac27ff27ee710a2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 22:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bc89142b89660941fa2749f3a1c0f786 SHA-1: 2bb7477b488e2e4d0afb3d3404698a013c270436 SHA-256: bac27ff27ee710a24739113b34ddd911d979496216a49dab7c8a1aaaf8b19f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 websites, including WordPress uploads. The PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3f198f03---66918263217.pdf In PDF document text
    • https://khabul.mn/mmpa/userfiles/files/53280013044.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/56238907462.pdfIn PDF document text
    • http://tfforming.ru/d/files/duvoxabudedowalov.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/13911441808.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/fajodule.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/fogurarugiwuxoronu.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/rawigux.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/36070705175.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/zunawe.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/58169188544.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/99295041156.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/83360857342.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/6526871905.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/palakewalere.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/11701108552.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/jusununutudi.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/pivareresebani.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ae2c148349e696105f5ca3882c1111b1/72577038388.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/nobepogokipogasesako.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cd287835---vopotogolejapekisizediko.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/pofunig.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/78752150056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=concept+2+androidPDF 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_off0000bc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9E 16392 bytes
SHA-256: 170f63541912f5e5fe6de31c2428308bb27516b8fc3b38d2ce8479a67a612743
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 10444 bytes
SHA-256: 0e4cbcbb67797aeb075bbffaa9d04e331a0307b2105d1adf664f18e5de9caf15