Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13753383e3b958b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 13:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6534ac4453b7d4646540c984221011d8 SHA-1: a0bc2e77c6c2dc1dd64379cf568cf226478a6d03 SHA-256: f13753383e3b958b58713153678f57a36a0069a810dd456d846fb5a4d408c984
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised CMS upload directories, which in turn host other PDF files. This structure is indicative of a phishing or malware distribution campaign, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ecb63c33f9255713cb82982644e7bb19/81158462745.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d740347fa5a---52683560635.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f8be86149dc75e70c18d83ba3ee7b416/fomafesisemutu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c8d9652f52ea6add0cca1a8ebae52dce/turitadunof.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f3ba4e4ecf0f615e19938c4a445e57c0/latadabikagowufelep.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/dh5o9j07pddv1t26lo8g1amudj/27774022256.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/72771460796.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9634399cdabf2c0b3c91c800def33452/43776354845.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/87c721fd5393e184843b6b2e79fa9a37/romodaxexowasebep.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/kitevezununawef.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/22018558470.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be438234e93---65681026740.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/59618ea739c7b175f69ff93e8844431a/lalodevumipopupese.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/pubeliwexumizibiwerisub.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0e7b4d75804036d3414b16a7940fb8c0/20980936395.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f292b15362f7ebe6c61c22b472cf4b25/safolekivodonu.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/vafukulamo.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/16833658280.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7r7h0kt9ok80i82d12k5b866ih/mesopegalidokoturegol.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b82199c49f4---wegewakum.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/vagupenawaveminiguzipaw.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bccc44660d8e41c6fbfdef9e90a71c8f/dadatosorowogoni.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca6f64db0---65327367906.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610302df924ea---tetaterejol.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b069c064a7c---61595316147.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/kipur.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/31176529054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=radar+adalah+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 15640 bytes
SHA-256: 7a6f71886b157661634b14e3156be716b38227de5b142ad8552e3469f58dab37
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 17192 bytes
SHA-256: 736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb
font_03_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 9928 bytes
SHA-256: 1fd19ef9bd12e19592dfe1ad8745c3372661f11ae99fe44d347487ba14a5f8d2

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