Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3be8f7be5e7cd29…

MALICIOUS

PDF

89.0 KB Created: 2021-07-03 12:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 70866b87686aefb325c779d412aa8bcd SHA-1: bb2b025222d75db628a0946628369cf05b919126 SHA-256: f3be8f7be5e7cd291fba4ffecef4218f07c2686209dd3aa4c75712425753335c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content, likely leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=what+happens+if+you+eat+expired+bread PDF link annotation
    • https://eberli-medical-supply.ch/upload/file/fofiguje.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/pesida.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865d64deaef---jinevefad.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d856b867e---mibave.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8501b4c6f---soritorurivurasar.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1bc4522f---rozuzevefezenu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095cae0ebf8a---3622300379.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vipinamobosegegazaxekoj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c2c486dd---mirujaru.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160948b9240213---morulutunat.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/pilofufaxipafagod.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608889e0a199e---bebopolutusavalug.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/64515387789.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/wogedotoputotaxinusabekiz.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d036642e54573de95f494fa2e5363152/kudopedudatejeriku.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e6e38862df75e954b7b8f31bf8709b0f/14637834527.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/dk6hqf15escgikbgdqklki27bf/36368227019.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f927b90b25---92851108052.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0f7348b6d---5546160548.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6aac1facb---satotume.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/l6qe3537eejgvs7kukv90223d6/81719939794.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/73c8cda69f18086f6ce5de49ae49b53b/56214686973.pdfIn PDF document text
    • https://sealskinz.ru/files/file/fujilutovazezog.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gpvfh1l3a255qrki914kljpjqq/gowonumofet.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/tigomidunasupijixokaba.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_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 10996 bytes
SHA-256: 283ac5e686f90aa5845ebe59cd36de5073d160f53947f74b41e8438e9874bf3d
font_01_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 16740 bytes
SHA-256: 65e742aac8c733313835a9a05ade7518be0304e23341ad3738435c176b43e04b
font_02_sfnt_off00013e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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