Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a60d3daf72708c5…

MALICIOUS

PDF

81.3 KB Created: 2021-08-21 21:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef25d2e588a2aaa7a8c0c876666575f1 SHA-1: b03653b16d7924cfa9a0f94d02deb060c1fe56fc SHA-256: 6a60d3daf72708c5f86bd3e209906b5fe8f74bd142e0bedd4e973ef5b0be9540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa804323e---81956774632.pdf In PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5fc61d6134f676df0a52e31c39daea90/76840256897.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/palakowubo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3de87470d4---42107644167.pdfIn PDF document text
    • http://industrialdevices.in/uploads/40138709510.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/dujal.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9348131d---43382025174.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/tozagux.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/tupiw.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/p0g8jj66nsbamluljd5fobaga0/korevelimuj.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/93085391811.pdfIn PDF document text
    • http://clingac.com/d/files/91419341457.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88ab3dee2a---laputuko.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/bojaditojosolagabide.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109adb0aa366---62069830232.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210805_C8B5108CD861CE8D.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/38266510232.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/ligiwoz.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/walap.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/73163544713.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/21290435437.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/36677180838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jigsaw+puzzle+template+freePDF 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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 17028 bytes
SHA-256: 9c838c825287829493a4028af045174553e3c8084775d91ea6e24598b96097d9
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 10712 bytes
SHA-256: 63bcbb344b2b33e3a7108838788104bd1fc41bec604cdcb91735158d925bb6e3

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