Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fe4c55f5d4dcbd…

MALICIOUS

PDF

92.9 KB Created: 2021-07-26 03:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d01975b7587c964580425abde7a7bd5d SHA-1: ae55c946fccbda8f41e6713fb7a29d70bc30af62 SHA-256: f3fe4c55f5d4dcbd12922a63510084bf52ceb3b31db7d5733da3f9492c5a0fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further malware or leading users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://fiscalonline.eu/app/webroot/files/userfiles/files/fuxifugojefepaf.pdf In PDF document text
    • http://clarasonic.com/upload/file/zimiruge.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8549c3e4---36858143650.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/jusezigovafan.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/wiwopibuzajopobilisere.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/la9l9v3so2jojp50obbmdedi58/rimozorezizodonajuv.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/lilajemezenepap.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vim4laoru8kqi1366nmscl0r5r/94526808450.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/852e4b8dd1072e78d4e5046279cc0406/fubirolupibugegojebumu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/geo940v3r8galtd7ul4atmioc4/50319484479.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72d340683---xelopeguvuk.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/85246097961.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de76dd22cca---jinopesutizaxi.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/pinurotisanuwaxujudose.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/24064882582.pdfIn PDF document text
    • http://ciskmv.com/css/file/26244936586.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/90d8df81f688c96f72ad8c62394392b0/rerarujavidadazonoxa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0atog3vd2mqcdkafrje1nn879q/13059419173.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/01a666a776a6bbe6df035bdcdc52aee1/1492983945.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/64449599316.pdfIn PDF document text
    • http://kesifveotesi.com/files/32213744800.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/vetoranetatatixodudu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3088ad4772---91836277060.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/2a29e459442ad73a8b25da954bd26861/80944368544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=food+and+drink+wheel+of+fortune+answer+cheatsPDF 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_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10828 bytes
SHA-256: 94874c27e338571f2d6fe1edbc26707c9c3d3c9afa7c06af14c4e6916591b3b9
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 18020 bytes
SHA-256: a9ff917d531456c34c4c35f147156cb2a88b7dab93d7f6310443545bd792a720
font_02_sfnt_off00014bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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