Malicious PDF — malware analysis report

Static analysis result for SHA-256 b349a3097ac76630…

MALICIOUS

PDF

90.4 KB Created: 2021-07-19 20:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1e7345937a305bc1b86e078e9092a9b SHA-1: 32e13aeb431c49eb2d808c5acb134a0382d2c105 SHA-256: b349a3097ac766304733c0b23edaacfc9e19c18aa7553dd1dab5be59448408b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to other PDF documents hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2ac1c8bac32de93e14602a3f47f82247/pitiravexumoxigaligelomir.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae0c9400c02402642994853f9aaa1f1b/67170997076.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/0m4b0a44rr8k4f5fd58r3v102i/pavetifedewisix.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/bamugeja.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/54694367917.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b337af54631---6519173360.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/25a1b03aaaed6bca4a12daf1019a28b9/28939974759.pdfIn PDF document text
    • http://ligneus.hu/upload/file/43217953108.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a61677c6fdd---55553510673.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/pojeba.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5mtdtddpd0ldtcavl56omc5uj6/pepezepovaditututiwofo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0ca1546eaea62fc943c61939fae505b4/80349883785.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca646131c1d---borub.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8193770b2---toxiso.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/99105443377.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/99035058323.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d77929dbf---40548856161.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e288827e7---vunaleriwedulumage.pdfIn PDF document text
    • https://actorconseil.com/files/file/98278728307.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/maloduziruzutisonepejaw.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785272148c---78314294569.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/selivevituvazebezib.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/ab7d262d8928544982138c5125169a5c/74483738886.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3covjdvbcsajch5g2j6clo6rn2/64456525151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cabin+stay+with+hot+tub+near+mePDF 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_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 10796 bytes
SHA-256: ce17dc38c635be531242e004a4f5c475249ee1d44217abcc2cc3b2cd8f19badf
font_01_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 17940 bytes
SHA-256: 34ee89182114950dd8f52cbb1718c23763bb9c0119ceac4ff290f25016b37a07