Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f81f0eda5c72d86…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 09:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: efe27ebf8dfc64757d51bd0afff68e0d SHA-1: 3d7eebc3ec917ef6db50b1dd4dac06ba1a0e8691 SHA-256: 1f81f0eda5c72d869e100b1655de3b7198fc67e759d13bff9709862f4a20a832
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 it is likely a phishing or trojan PDF. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with attempts to exploit vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=megger+mft1741+manual+pdf PDF link annotation
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/flg120c5plqds47kk650np0qu0/16348941598.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7099aaf74---fonufepo.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/8812412681.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5276997413f4572eee5e82c3c00db7b5/46234812699.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/24918547746.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/19c9088fd6e343435782eae7cd5cf2b2/73307730078.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609054d4dc8a3---45618036215.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/dukapexedipifixuxuses.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4d696979115cf6f0e24d71487e40f4da/15719579903.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/nokagukakenagagalakila.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/sufikusokolodufipumegufo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502210604226.pdfIn PDF document text
    • http://ranch.pl/files/file/41856295249.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/danawozov.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/11600427588.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dttduuaa0jl15qumm1ojhdsm2r/zezegevopoziwazufa.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/41794481466.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/lj2hds61ro6atdtlni4h2dhjs4/zigajedalizebiwan.pdfIn PDF document text
    • https://angkalaris.com/contents//files/purozadutubupul.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba724f415e6---17005064646.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a78ea669c57---8879204313.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73d3a9fe3---gumozevusudus.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a8973dc7---74123326802.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/be4cbbf2db45bf792f7d80e03a6aa49c/kikurozoluxuxami.pdfIn PDF document text
    • 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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 10736 bytes
SHA-256: 3df17436105aa2e835bb55dce411c96812685e9b7f88bf2faa03752c9a95a3c5
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 18412 bytes
SHA-256: 5180485a49002dccd86686d3abdc301c91148bfeefadb98191be9b37c45ab7cb
font_02_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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