Malicious PDF — malware analysis report

Static analysis result for SHA-256 df73dfab0db87f1e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 11:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd5bfe67b7181b3a5912bb789fc7c025 SHA-1: 04b9a77ffa596232ab441020bdb11a45e929fba9 SHA-256: df73dfab0db87f1e7b520e0e00320ca443b26458e3f5e84ead9a60a015dce7cf
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to potentially compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sk4education.com/ckfinder/userfiles/files/68968600740.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199786305373.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/reloseziduzub.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/185681824.pdfIn PDF document text
    • http://pololanna.com/user_img/files/77611377006.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/bizafol.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wezabedu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e78295509---58422362461.pdfIn PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/1492727450.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8b6b4341---pogekimu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b92a90ed---xemojorodajevanu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8992d6b0be---bazajutinixudesuxurededej.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/41693783736.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/wetutukoxadetoro.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///40934097632.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/sufitofeneberulutafojik.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021081318541073499.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/vijijozopegumosemoxexer.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/83450303314.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e883397b3---newovujelibimuza.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0c534feb8f935e7b7df9c5c710495238/wurisagubapeki.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210903175847.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/zomulumemixofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fisher+and+ury+getting+to+yes+pdfPDF 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_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 18072 bytes
SHA-256: 57d049a5970d9d305d8622ef90389d9abb81ae2050640c00d67681ac08775c3b
font_01_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001335e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335E 10924 bytes
SHA-256: c8682db8ad47510c106e408a1364ac887d59d655f4766f8b5be5d19fc886383c

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