Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fe394268e7829f…

MALICIOUS

PDF

80.2 KB Created: 2021-08-21 06:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a17e58a07dd9fcfb892781963fedea84 SHA-1: 604835a883ab35a119c393b5d4d3476fcf5fcc1f SHA-256: c7fe394268e7829f8d6db62b97a12203cb123620f17af1534bfecc246322a940
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://babywagen24.de/userfiles/file/63260632061.pdf In PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/20o0fcdvmb76uovkldm660hn04/retizuxibasoxakitize.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/15f7eebb52c80e69b295e1a1e3f7e4f1/worotawowipik.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/93415110996.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/25203844744.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/nobuxevu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1d7ab2f7d6478308e1739b639db76ab6/11640190855.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3nhamtjb39ni2884eq3lsjeh59/80967374108.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/loririruj.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66b753df15---jedota.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/sorixute.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/38298953742.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/34347027759.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/79859058094.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/66519301651.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610f216323063---galidazerupu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052400171173499.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/rexudigojabevanujisaweki.pdfIn PDF document text
    • http://chpcentre.com/files/file/savudobesipatasabifo.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/rezafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=why+is+my+mxq+pro+box+not+workingPDF 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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 11032 bytes
SHA-256: 055bddf42c52e1784e6823b7ca1768abd7df764c2b6a35c69e214b382d693144
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 16764 bytes
SHA-256: 70c671fa1f2b5599fe3f6646fe7195b73b88aeddbdb93a3a8b0b97db13e7606a
font_02_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1