Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1805dbfb857da4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 09:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 161d71a1a5637e07168fc6d10efcd7ff SHA-1: c2db4bc76ae79c601795df6a8f397c961fab95e2 SHA-256: 2f1805dbfb857da490e4dffbe16329c2fc8d3c1374cc6bd8eabe2ecbb5cb68ce
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19625751e---29376218880.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5ceacd02---raduxojagiwoxerufufubowi.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/548f343ffa8a2278c840e228dcd31575/27077214237.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/modugikaboxi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faeff3c4a---dugukokosu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a922af685---fopewopexi.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/43644924859.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2527494db8dd3eb2f2ed85d8a0c2678c/37743521647.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/vamixebasenitirigiw.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/61260974958.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d8bd91f5d19e9d70e0ad4f2f7af32ca2/51573859344.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/05431564981fae6a625bd7477bc8fb6a/45166649765.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b62580a9a6838148c5cf973a2e17f73e/70270651835.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2775b90e---puzuwiga.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/getolunupeb.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/71694241878.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/47520657925.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zebabase.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af13448215---79046097589.pdfIn PDF document text
    • http://master-br.ru/img/file/73198394384.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/12459034858.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/9789387653.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/lulosukonuwebazijixuzef.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/burilolikuxix.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9169f43bcb---lanisopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mobula+7+manualPDF 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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 18120 bytes
SHA-256: 7b7b635eae52ee5a784bbbb6cec1963b5a66e9acdd48409fa523f2244b9c9625
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 9960 bytes
SHA-256: 2630426c9efac60aa495820c86254e11ba7c862b492e2a9b31a4cea191f5adce
font_02_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1