Malicious PDF — malware analysis report

Static analysis result for SHA-256 f737082229f53ee7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 14:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6ce6f43a69de5dcd5bfd582866dd69a SHA-1: 404b5c368244a13e7257ef3b462b3b3293903301 SHA-256: f737082229f53ee7ab78bca758788818a50212216452b0ebf9d640dad6e058e1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://safaraval.com/basefile/safaravalcom/files/56583991789.pdf In PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wafowedepibuz.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/10177546804.pdfIn PDF document text
    • http://ukrfirework.com/images/file/48203793056.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ntfk9j0u6ol7eolrkaimhest34/84089808743.pdfIn PDF document text
    • https://htmlpanda.rockeit.com/userfiles/file/52062779261.pdfIn PDF document text
    • http://araratmebel.ru/img/file/64851048312.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/14222465090.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/72015825544.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/99208309393.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/43864874498.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc9b262c9---31201624225.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/detabali.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/4a26f0852a3b9d214bb4901146bbc655.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210922_225534.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/boxuxomurexiseti.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/17464873552.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3a6612aabf6713731e087f5a3629a965/50519194086.pdfIn PDF document text
    • http://gr-chem.com/upload/files/64373806074.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/wijiro.pdfIn PDF document text
    • https://digiconelectronics.com/media/91449561013.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/5247338052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pdf+to+dxf+open+sourcePDF 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_off0000b377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB89 17748 bytes
SHA-256: 0f762bed978b1207d50f9a5acb1df6b409d300bca88ab72be4c201604ff71f16
font_02_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 10516 bytes
SHA-256: 0a693c7f6fdfc9ee451d0ca82387fd66e39f168095ba4f034d6499b8d5a952f4