Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcc9c0729edd0b1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 03:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9965a3e9886f4a42fd07b5ae20b4e9f2 SHA-1: 1a73d1b1ee615490a38775aa822b6490f3717c6a SHA-256: 2dcc9c0729edd0b1e26e3cfb3d7398d332f959c5ed3025d91b6e7221874c8d06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://intervalhousehamilton.org/ckfinder/userfiles/files/96997034799.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc934a5683---60354323967.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/71384686326.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/janarokopirilazeti.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/kukulinumew.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/3424522601.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/59860668801.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///nudogova.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/79775416698.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/wideresagibimavilaneker.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/18613394037.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149146525aeb---legiwudinabojapejunawi.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/diluxunesemafogobogozipuv.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/24010511502.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/jejevararadopozo.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/44843243824.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/kufigavowexikixa.pdfIn PDF document text
    • http://geraldinekilkelly.ie/11439770329.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/vafolix.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/86159116339.pdfIn PDF document text
    • http://standdominica.org/files/files/debarejakivus.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e8cbf108fd9a309102a074e6d22fddc8/47281332416.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/zepepazipaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=angular+front+endPDF 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_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 15468 bytes
SHA-256: 55036bdd7f040aef4d9c447c1d5ac0035f50c8c91b5239fca97d0b2b7918d84a
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 10352 bytes
SHA-256: 9da75103d11ead974d57227bfd9b022f7a89284452008c60093ef86ffe1a2b29