Malicious PDF — malware analysis report

Static analysis result for SHA-256 29aea15e7b19b9d7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 04:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ced2e6041e7c288323c4bbf643d8c38 SHA-1: 98decf0630823475abe6879b17b000f10532b3c1 SHA-256: 29aea15e7b19b9d7f9f09e55ecce7a5084739a2af16f45528a371fd5795f736b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://namkhoabacninh.com/images/files/49484326750.pdf In PDF document text
    • http://vamaconsulting.sk/userfiles/file/26865562745.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/16211054018.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a081e6af73e---3148970639.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb742eca3e---34740926870.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/aa21919ec153dcf438c9c999d9ab5c6d/salolosenoteku.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wemibonolovo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cecae1366d---valomijana.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4750da3508---25721697127.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/69618068396.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864172c5ea0---mosarovavimus.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/47545570103.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/aeda0577800148d8d1cd5edf24d7857d/fakuzajafoziduduvomi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8e3e819e210ff8801938b3f467b7d7aa/15786136703.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/xexidobubavojagolet.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/putorar.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/25/file/994483533.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/gujarumuzimiloxunufapije.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/wuvinonima.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/3581493197.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/edg1nu1kh9tb095jqibrsk04c9/tifaxabegudenuxexul.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607947fe03e73---mebixusefurawazikifadumu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089df06149fe---rezogimaxov.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5a6921e3---34588652512.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613665329133f---18002049349.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/iiad7u989vdoibdf9e5p87gva1/66283029159.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/32808078698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+printable+beginning+reading+comprehension+worksheetsPDF 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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 11256 bytes
SHA-256: 28dec2cfae6bf28f31fe6dbe717646ef87ca952f286e9a3f975dea4e52372bce
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 17600 bytes
SHA-256: 457de73e3fa489d8af2b99b0e40d2ff8b4d2459c86977284755b225e6155af5f
font_02_sfnt_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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