Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be8dc770b797a86…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 01:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc6116a4da38194b84c72691153794a4 SHA-1: 7bb4ff4872376e677389e8f09baf67941d5b09a3 SHA-256: 6be8dc770b797a861246ff9597701caa28f0c2598825664a45f8a2abb42263a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

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://inwebjor.ru/uplcv?utm_term=how+to+calculate+bmi+manually+metric PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-6-8/20210608175650445630.pdfIn PDF document text
    • http://eva.am/files/9b6c3c69d93efc7f.pdfIn PDF document text
    • https://drsaman.com/files/46300833924.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a116f40edf---niwulonova.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/58754435832.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/40809089729.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8af98b4de565a069f1478ac89fe8cdfe/dinozofukamenebusedadul.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/59658357007.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073af521c0d5---jupudamodedewimevamutexe.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/f6dlalj64mlcbj55l969oap487/gunerixizuril.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/wozajejuvujo.pdfIn PDF document text
    • http://vuason.vn/upload/files/waxerisizijoguxuko.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/25823708814.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/kotatufez.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160730332e1a40---84846553178.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d574ae13ab---xebanuxoxavogetexule.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e0b086f5f8e0adccf3dc490a7d235463/91247135171.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108281519379050.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/82102617170.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/73515307980.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/678d4434e593f2bbf90fa5c0630d9028/53972016019.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d683debf3b---jigiguritire.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124a7dd9aa1d---sononoresuwix.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lpkchhjtkf0k8ng21uiusc95r4/91519597557.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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 10652 bytes
SHA-256: a335a0fb84658efe177f769ec8f09bb2785b952ae8560f282bff3b26440d831d
font_02_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 17808 bytes
SHA-256: c3028bd0d5fec68b9dd44173ac301d7ae68ef7b5276a2867324d864cdb2308a4

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