Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c18b2ffeb7a5fc…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 02:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f45c768b3423062af28b734cb5bf4b39 SHA-1: 843205800dfb2248a19e5cf25067611dc27d65dd SHA-256: 70c18b2ffeb7a5fca1af8b6426c0f6ae1113aef52f0f0516ad9a9bdef5e63264
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to phishing sites or download further malware.

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 https://coretry.ru/uplcv?utm_term=ainsi+parlait+zarathoustra+pdf+telecharger PDF link annotation
    • http://tomasmrazek.cz/userfiles/file/60198328452.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5e88dfaa0f58c4c11ffb3f88c52d9538/vomovivekadofikazewafix.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/79766911749.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/17415706055.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/guxoborilozori.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/piderorosajemazu.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/magiruwemulupoxuzijiloso.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120f8b7cf74b---bigifes.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/eac1920f59c3092dd2a15677781a571a/94859255746.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2fe12318---40491525257.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/84645480125.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/38036233860.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zapabapoji.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/30122438669.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/farukalavikofuruwogotirij.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/12625380324.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/gawobonugotovujipupazuger.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/kutotugevube.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/44192506807.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16278042483193.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/7492961841.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3df626c38b3b834c2dd526a63cd5c383/lotokat.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a371f1a7a57---wozozepovudopuzugazidi.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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 11040 bytes
SHA-256: d532c7f82e280f9ad00dfadf1133afedb351e86aa2a5e8f8a3ec694830419605
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 20544 bytes
SHA-256: c28a62d726ab2949e66a0e647629e888662d4c0d4dca93307cda10ae17e958f9