Malicious PDF — malware analysis report

Static analysis result for SHA-256 084e1d024e6a7447…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 02:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4fc382dcb5f0db648c6af05abca8d36e SHA-1: ce42b571831cf2e14d387c52e70c16f087b71311 SHA-256: 084e1d024e6a74470af06788acffd121fe5dfa28db4ae1aa0d12191b4dde4c1e
164 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 suggest it functions as a link farm, potentially luring users to compromised WordPress uploads or disposable hosting sites. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document's content is designed to trick users into clicking malicious links, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/kexigirexiweb.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/44934718064.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tavegifoloxuxas.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/voxavokirusesele.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee7b87106---mufisubitikifusimenavale.pdfIn PDF document text
    • https://arerp.kr/data/file///99568396850.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/t7vb9hpvq0j8utsv6t6g2pm2lq/rafilonuxorulejarexemezi.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/giqatbh22dhvs69ta0tr3jpvfmjp48mf/59458635625.pdfIn PDF document text
    • https://kham.vn/userfiles/file/perelotakofuv.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/388i4hlne9819vclk6aupr1s1a/76355185872.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/99601537946.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2a219f61---26363701387.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3570eacdd---zifafu.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dk3kv89fo8tp1en03epvcralp5/xowegiredisen.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pevusodebi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b8b40ae0c---89387810879.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b2a3d6675e106b28fec09568add32915/65239068904.pdfIn PDF document text
    • https://adikkedua.com/contents//files/xotijadoluvuku.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/nisanumojovis.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2orpmr4dbp5bng8os6qr4k8vef/69911366200.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/55873163774.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/gimol.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/21880511308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=letter+of+authorization+to+act+on+behalfPDF 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_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 17260 bytes
SHA-256: b280732d2880fdab4fd5c9188d3377623f0e7eddde91c81360bfcad308061d33
font_01_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FB 10520 bytes
SHA-256: b4c71741ac93f04bbc61ea98087248a160e1c7331dfb4cd0bb4c77e06d57507b

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