Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35b8672141376a1…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 13:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9885fc102517d87a4d7022f18c6b6a10 SHA-1: 8528b6211ed253ddb48eb7b86e866a54d4276d8c SHA-256: c35b8672141376a1bc3a4e7ba70de59afcbe95ef2503e867ca9debab892864c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. These links are likely intended to redirect users to download malicious payloads or further phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aydinservis.com/ckfinder/userfiles/files/78589100629.pdf In PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/11669020267.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0ae57370---12041287783.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/6728343715.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378fcc04a01---72323978952.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/91881912070.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/4876292897.pdfIn PDF document text
    • https://shunnasato.com/fejirafinanuxojagagapu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae63d57e98---lewupuzodonojevi.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/90611024126.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/78161085888.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d76c4aa60---49093635394.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/67752858934.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/73316810570.pdfIn PDF document text
    • http://kd-council.com/upfile/files/82431989858.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/81380710866.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/68727275350.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/larutedusejifuf.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/14161910208.pdfIn PDF document text
    • http://mega.kz/media/upload/files/venepozega.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/55692044841.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193752553026.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/gibomajojenuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+sister+location+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f451.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF451 17736 bytes
SHA-256: 2880ce6de37278fd39319429a43e07190ead15ee5c73616037981391421c9858
font_00_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 10684 bytes
SHA-256: e35b4e0fde709e9c5248db0bba1dcdc79a47af4dfef17f953db1bd4836280de3
font_02_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 17228 bytes
SHA-256: 20bf1ec6fb810f17799d2f8aeeb3fe6b560affa0fd2f0fb6623a4a5ab8f19e26
font_03_sfnt_off00013c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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