Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff85c96a23b6af0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 10:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8d629a2837546a6fddd46842bc387f6 SHA-1: f77bd40e5e5f47a2edde69bed10db4be967a5756 SHA-256: 5ff85c96a23b6af0e441e7fda0205ef9a9a1ad7c30fc115c790c9a09bdeba64d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aescantabria.es/upload/fckeditor/file///sorafupo.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/62085214364.pdf
    • http://ndt-tl.ru/upload/file/motaporuxunan.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/34831198561.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcc687aeb---94364770026.pdf
    • http://www.lnk-creation.fr/upload/file/14523637522.pdf
    • http://pinturasoltra.com/images/slider/files/51424293469.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f5090e469c1c5ee72c4ac5afb664da10/52413049243.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/murenoxifoxedakerebifid.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ed215dd1---37264889596.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7dbb4887fc5d0349b805e159d5199662/dapidawugabarimuvotavulo.pdf
    • https://elesud.it/img_pagine/file/ruforugibe.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cpokdp8c7bou21e9ceqb6lavl0/mefotagaforaderivege.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a695645b89d---38477923297.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ddcf4d6f8---36936659702.pdf
    • http://pttaccounting.com/userfiles/files/71122461139.pdf
    • http://hoacanh.net/luutru/files/fivezevitanefuximadiluraw.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36ef65909---29698548949.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iu954gp7ipsj7vcglgse74ohe5/tuvelakawusogagoto.pdf
    • https://nedimgame.net/calisma2/files/uploads/dapad.pdf
    • https://oncetrabzon.com/resimler/files/74050286436.pdf
    • https://goooinggroup.com/userfiles/files/20210626_065305.pdf
    • http://artospace.com/pics/file/rufisedowisipujuzurelumu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cross+currency+basis+swap+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 16792 bytes
font_01_sfnt_off0000f0c9.bin
b7d9b43c704aa2fb42939a02fdbf8fbc472cc2ec6f52a1b74f4fbf12fa173547
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 10940 bytes
font_02_sfnt_off00010a1f.bin
1495b34f550bcad128ccd5af1c18a5d1c4a2736c01ba0f80bbb1218b75f7b56e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17380 bytes