Malicious PDF — malware analysis report

Static analysis result for SHA-256 712d5db63cbc5337…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 04:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f34301e113fb536ed3017c2f60278e38 SHA-1: 038215e9e7c232f404c10658fbac1f0d15bf7e75 SHA-256: 712d5db63cbc53372917dffab14458c88a9fc510f2bd113455c63a902406752f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec13023ad542fa70bdd8c72796656e86/tedanemesugavegibu.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f5e50b0e072492297c2091ab70fefaf2/11255847864.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/loribo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/19227423260.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ea35n1b1iv4suofi91qq2r8dsk/53311788246.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/61841083130.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/38b6169b6ca2c23faa46afdf2c3ebe4d/65714669669.pdfIn PDF document text
    • https://mavibusiness.it/file/notelerapuzakenolesuvabe.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/15788134196.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7595ed7d0d912902d80642e87f8a5c1d/55631521316.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/fopovakatiwetobot.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ad6caa7a23d3f34117b4aadc4617fc4e/96416294728.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b651da48dc61620535b46214f03862a8/zeteluvubutidiwomuruso.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/6447953487.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/97430338598.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/128c02b54324525c2c51043fbd7dae60/89504442784.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a34f98e72b---4460510287.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/kejakuwupe.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/58rs67pkdj3t2cm60d775r22g4/zivusaxafuda.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/soximaguroxegutidukix.pdfIn PDF document text
    • http://boxethai38.comupload/file/15667426283.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gcpitaen9b0dcfris2vp9kljf2/rusanasijolegosurap.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/rugipikepubanav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=economy+of+pakistan+book+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 18352 bytes
SHA-256: b8143b6b0773a13ab9fcef5e7255bac3f8989f5f4600e6036041873aca017307
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 10832 bytes
SHA-256: fea0d2a4b5a33946065b058bd44ea12ee9e054a79424531a95366e6cd80e00d5

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