Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79bfd3f84c1ca1b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 04:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22047218a7564cc5e8747a55d3e3cfe6 SHA-1: 8ebd72cb42dedbaafd8cd465cc24e4b316d89254 SHA-256: e79bfd3f84c1ca1b0d1bd32627f4a5c5729187f3762d4a0e209cd712a72773fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://irlanc.ru/uplcv?utm_term=how+to+convert+itunes+to+android PDF link annotation
    • http://ottomaniantextile.com/userfiles/file/lafizosope.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/16017659902.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/63247630868.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614003d348a09---mafapexujemakilixef.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/sokopojigibi.pdfIn PDF document text
    • https://petala.gr/userfiles/file/gewetenofujipeju.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/wazijisuxigatomunepe.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/7591092628.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161317e9ae48a9---33817969376.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/23358390555.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/25243454980.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/nezubiwuruzarajosoxavekut.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/55741219237.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3dk785d0uk2t277o7sibkd2cu7/gifeboravovusibus.pdfIn PDF document text
    • http://warehousetraining.ie/images/dazulam.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/tadetuxidek.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mejofin.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131282f5862c---80599686939.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/nimovuwifasepiwegedasafeb.pdfIn PDF document text
    • http://zgic.ru/!upload/files/76860466501.pdfIn PDF document text
    • https://chv.vn/userfiles/file/lebesalaloposizazu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ce88j1vifvjkhvvm47ljak8mkq/40829257592.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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 17452 bytes
SHA-256: 66285e2c4b9fb6a1a08bfb496f8d932455c879f28891d868ecf366978b60bf53
font_01_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 10560 bytes
SHA-256: 8fd755b9fcf2712e7c8a87c5689c9767d077e1077325c1250ff915148092722b
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1