Malicious PDF — malware analysis report

Static analysis result for SHA-256 c974eea08704c6c5…

MALICIOUS

PDF

161.5 KB Created: 2021-07-10 14:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 95cf7f27f009b0d31a674c0fdd0d6ad5 SHA-1: 0c561c924763a040e83f07ad87765d5871f46f3e SHA-256: c974eea08704c6c59629e13e6b855f795bbadd212461a58caadd9dae1ffc08fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or revealing sensitive information. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://coretry.ru/uplcv?utm_term=to+have+the+mind+of+christ PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc36a2967---naberita.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7619578677---vuriwonevofasejipon.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096212607cd8---72573990736.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76eb508a8b---88231059496.pdfIn PDF document text
    • http://jaika.in/images/documents/files/boludozozepazer.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c97cd5a9---mumulakerozekuj.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/73495561771.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/tevigasitifanineguwuko.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca57a8b6cd---24589079773.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16088884139ee3---58893884674.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e35c6f77599---91853868114.pdfIn PDF document text
    • https://mfdesign.hu/files/file/89566648600.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/mijobubijamowikuwafu.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/838bbf9fc9d9f609485f11a55fd7c611/33664705948.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b09989b3---84453296290.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/77f4c1ea18ceca28a51c87a2297b707e/rapilakeguzixaz.pdfIn PDF document text
    • https://ivaco.it/file/48186637711.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ddc79ed3---tofinorawijinan.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/97e01cd0ab1f0bb22011928a0d6d3ab1/92178826903.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0469db54b8f09938023234810d8a0911/99321506344.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff6d5d0f4---39490315706.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d88b6cc2d9f1d79fa0f8a3e9a0df205f/39046784932.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0b4de618efcd8111a185063234427660/44613266188.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb12f38537---kemogixiwapoz.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16091403f5bdfd---91480579796.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00024550.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24550 17492 bytes
SHA-256: da0587331a5399a400ddc918f20c498b5d5f5b5102b83d3966601e973420a25c
font_00_sfnt_off0001f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F391 22600 bytes
SHA-256: 3b4d0ee2f75dd87dbccbbbd0d1d62535a57b03dc7a3a0d4d4843ba7c5f16debb
font_01_sfnt_off00022cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CDC 10724 bytes
SHA-256: 7bdccfd9eb35900ce51d7af85304af8cbc11a4b6a29080924074291f5a5f1fc8
font_03_sfnt_off00025fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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