Malicious PDF — malware analysis report

Static analysis result for SHA-256 844580221461c182…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 07:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90d4569ec102e0dc2a48a490e7647ad4 SHA-1: 4272c12e1cdb43566de3a0553382684d37aac778 SHA-256: 844580221461c182b001cc11e3f422850de1070ec73669760ca775c5054980cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=mopar+performance+catalog+2018+pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c63b57f3---74883748785.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/49313795422.pdf
    • http://mtsskzy.com/userfiles/file/tugigobojebosofator.pdf
    • http://thekitchendesignstudio.org/uploads/files/papuvatosalamebuvobox.pdf
    • http://baohanhranghm.com/upload/img/files/wodilebatideliwugukegeku.pdf
    • http://le-bouquet.be/userfiles/files/suzorifuvukopulazuguj.pdf
    • https://supermagnum-bg.com/userfiles/file/24059824873.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ff9895624---temas.pdf
    • https://cheeselicious.net/UserFiles/file/livegagefofis.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/im40or2pm9uhjemnbmemqkss75/5339994967.pdf
    • https://mysmartedu.com/uploadimages/files/tabukomida.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4f7a43e3c2507a5d0a56f1b3b9e89a01/wolexumokulifelemaneda.pdf
    • http://tecsun-moscow.ru/docs/file/zogabakigikedexomaninozo.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/864ac5578189f238085b87ab95a414e7/xawevoka.pdf
    • https://ncvpte.in/userfiles/file/zobaperuvululibekun.pdf
    • https://aaaxxion.info/images/file/petepamowiriwelogot.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/10828047273.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d25a23674---mukuvarevegi.pdf
    • http://ahjygjg.com/upload_fck/file/2021-8-26/20210826145919491331.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/mobejirikaloloduporovi.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdadd4b8a2---kiporijoxapofudagajurevut.pdf
    • http://www.jindatunnel.com/up_files/file/jigan.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/oth6l1uiqv5cobvc4itlpatncq/83167454781.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ohul217sihfmn2v4gsktct4l44/mijutovupewaledokikegon.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb56482efe8---67906125221.pdf
    • http://1carl.com/userfiles/file/26476212642.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_off0000d987.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 16792 bytes
font_01_sfnt_off0000f199.bin
782122200ed819d670e550e7d587a209d50a72ff10cf79d73f46d1cc90d4c100
pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 17788 bytes
font_02_sfnt_off00012085.bin
ab864a281f139bbd8c7b6fea26494fdefa449864deac85e4caa9f6c36c24a948
pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 11200 bytes