Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f773db801f8994…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 10:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca6cd940e832045c9d231ece567c1d2d SHA-1: 8e950e4b3208941540639101ef4d936e8d36f33c SHA-256: d5f773db801f8994ac47a148daae746505fdc77033429f3ae01f699d56c0b17a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, with numerous embedded links pointing to external resources. Several of these links are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://1careglobal.com/upload/files/34556733243.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c019c512---774705434.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/htoq119crva5k570irmsaf94u0/sasol.pdf
    • https://etadelloro.it/images/file/30724484144.pdf
    • http://pogservice.ru/userfiles/file/baloriwipe.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8rhevmr9mmp34rl84nddntumdu/sebikuwikapivoni.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607800eab4791---10868007130.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e5b9e4e59---lujuxobenezovutogotirur.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa2001145---82645206452.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b24362fc391b23300caabe0b45ba73f4/natedofelu.pdf
    • http://littlepearlbooks.in/data/eimages/file/52134322965.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/42f590b018b732a45b1cb421e7a0e17a/zuwonobirog.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6d1eefbe5f3449350eab317194ab0e7d/67953341003.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16085df5d7e31d---1186254471.pdf
    • http://cloverdiamond.com/file/dunumipibokuj.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/83c46237de80686fe77c1dd85cd74320/66242884062.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/23b0f067d0f7a0151a903a1dcc4b55e5/dilanidudivesi.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d678218915---duvekorunamevefivifisaj.pdf
    • http://lhsclassof68.com/clients/73441/File/xobujotabovuzutovanato.pdf
    • http://mobilenmr.com/files/files/powif.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef217d6c15---24671928627.pdf
    • http://mg001.cn/upload_fck/file/2021-5-12/20210512101949578442.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/40d863cf82c469d2c722c96029733216/81972142803.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/845047947.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+unlock+the+king+in+castle+crashers
    • 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_off0000e953.bin
e82bc55d1b9544375ad6b9668bc36c7c6fcefdad3961ea02a04c77265c89ea56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 17432 bytes
font_01_sfnt_off00011646.bin
03815604367f795dcd3cec2e5f73183765185e456e8a56e03fca25bb350890b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 10780 bytes
font_02_sfnt_off00012f1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 16792 bytes