Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d598f45036f2601…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 22:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbba396f9b707fe403a2fc1dd7d538f5 SHA-1: 6cef59326c08601e8f4db4ae59bca3df19615799 SHA-256: 3d598f45036f2601907e7269a17086f14e705c2363f014cf5342e7075ca2f558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=parenting+style+four+factor+questionnaire+pdf PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/26092303205.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb58271d1---fogotoweget.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/bebarinirutomiteferarak.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1b88ca32---15457486206.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/84674437244.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173746a5c4---64558527929.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4hcu4j3vmd8st95hhevj2t7sjs/texexofatabisegifunekani.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/92323226002.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc377c0cef---fuxulosibomolujimizabuxon.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/q3hrm72pdh5fhv6gse8feo68b2/fenuvujebapi.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/besafeta.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337246be15---65206025698.pdfIn PDF document text
    • http://meta-min.com/files/volitu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/feselogipi.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/69587527463.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7cf5a9cf9a362f51738cd50647f13e39/69749473392.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/rajg4r1kra6ep5m9hrfjumm9u0/nusurodopes.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0eac31efefb63b26e8ae42bb19abd3c6/sotujogoni.pdfIn PDF document text
    • http://hainfelderteich.at/69673170230.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/6519057551.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611424ec46b43---66408880345.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/gomozez.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/pawonerenuwuzuzisidomodat.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/wofivo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 16908 bytes
SHA-256: 9d6ebc6c1c890ab9a144c0cf544a34b7525ea3482ebf16c234c58db0b8469017
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 11156 bytes
SHA-256: b609a13d9ba72182344ca1357261d7248e58da27f0b01e5dcca1c64f31b3612a

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