Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7c78ffa44ebab2…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 03:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f41606eeaae10ba09a2d7616faec6e83 SHA-1: 800d3e2dcfd4e2708d290135f8d4a6330d88a825 SHA-256: cf7c78ffa44ebab2e42a45225e2c03ad38f1af0a6d4a1c97b4ee02dacb343afc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links suggests the PDF is used to redirect users to malicious content, likely a phishing page or a download site for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a193777e5a---30801174685.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bv757jafc5scs2gn596f2cfd8u/21753249405.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/48648844071.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e0f0fcdb921e15696dcb667ca21a008f/worutorifefomuvitibixu.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0013027641---jinovi.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5db110dbc---40547934873.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qihl7ulefcr46brgatm1krnu97/zajimagodabowironanesus.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2utvl5sdipkfhcojfqhfvqo9gt/dazotokoreke.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2930df03a3---gesizujukebowameta.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088963b61a63---80438051601.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tc1l6i8t0bupvgq898055q1q0n/likukab.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/95520855534.pdf
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/durunem.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f77656e7b56936b4fec4bf8cfaf84654/bosoxakitut.pdf
    • https://bruceleevideos.org/images/file/3092163228.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-22/20210522022914179607.pdf
    • http://www.anjhimayath.com/upload/file/jawesapazupixowe.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3101c6e98a657576e861f99751616abf/filodedibawefowami.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb4daa043---kalososutimagofo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1bf9b963---jagimetugotigovewi.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608785561aa95---26821777096.pdf
    • http://alibabashipping.com/userfiles/file/nidusejakokoj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=yellow+toad+frog
    • 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_off0000e893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16792 bytes
font_01_sfnt_off000100aa.bin
f1032f255084c7c4ab6b01f509f43be9fa5e151f68a59237573d933ec2b2e103
pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 10232 bytes
font_02_sfnt_off0001179c.bin
0c9960963a7e89a08d0f3576156f4473d949d25c59374db97b29283f9f1b7f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 18204 bytes