Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b7cc38d9b1af6a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-09 08:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d05d1c6f54520e0ddcafcac943b7ec26 SHA-1: d3fc1f8945e9ec7440b65ee19684984164b16565 SHA-256: b2b7cc38d9b1af6a417b4ebb5f4a0eaaf332056886e2271049f9209b579f36d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. It functions as a link farm, directing users to multiple disposable hosting sites, some of which are compromised WordPress uploads. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8bd7e297ae5255425e52c685da9039da/wapovobad.pdf In PDF document text
    • http://gzwep.com/img/file/20219834659.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/19101075209.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/rifivemisiresevedes.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/32278448193.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/19066431839.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bobogowoxepidizi.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/71757246164.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5d97faeda0e3e5858750f564329a2486/webogobaderebu.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/18729703633.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/90038628805.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/52516999484.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109050827025420.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/51645512254.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138742146383---68190734075.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/47127897115.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/1915783691.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/48323358046.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/satojodofojesikag.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/bafawobifimen.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xowipo.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/36101882509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nimc+mobile+id+apkPDF 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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 17984 bytes
SHA-256: 492e9a7a8caccadb242c0b4fe597d1d812c95107d499addbbb33996f13fca34e
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 10416 bytes
SHA-256: 456c1e4585fb018ea59e62de60880c6a732e0a4b478b77743dedc0aac7268bcc
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1