Malicious PDF — malware analysis report

Static analysis result for SHA-256 9323dab9c3299662…

MALICIOUS

PDF

88.9 KB Created: 2021-07-13 19:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cf4a7bb7d5ae982bf38504b52a5a10d SHA-1: 548f7258d5c2b7ae2cf7745c3fde6e89456b4fe5 SHA-256: 9323dab9c329966262f71b02132d79497ae656bf691a50183df377638172f5a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=welts+on+forehead
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4e45d383---tunizevukama.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca7f1a26---55843066842.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8e61b27f9---godiwum.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2273a2296f---46331730888.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8773aec05---79359746738.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/keqc2qperrrdfr4q4vrgfqh51i/38664490480.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/o60a1t3mdoq6orvp2qb585gmbq/kadabi.pdf
    • http://ty-universe.com/image/files/20210623_124439.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9ea8dc667b07a8d8164cdec2a0fd75ef/68655028414.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/grib0ui2cia5ba9mmid6j5af1d/52488076210.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607019c313b14---vamutex.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k50hla66okc4hnma90b90gvee0/namufiluvodajufoveliba.pdf
    • http://vagtteam.dk/userfiles/Files/jekofe.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/572452a99e59cf500076c2a17662b658/2413967910.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5696ad1ba8dbf3b9015b2a232f893dbf/peniwuwidoripurezozabefo.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f178b142d4d4f967d0bc6063f1cdc152/3319679055.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jptss29uavo6jlma4g7r6bteo7/vizemuzipesitefabuv.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070137dc6e88---tesuwelo.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/6k25hp032sac4krhmsi8rbqbgi/benelumedumisiliga.pdf
    • https://kodcomputers.ro/2664/uploads/64419982311.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_off0000fb75.bin
4f6a22ba4604535ec3b631b8257a96130758d197e9f7c358a786b25a736a8cc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 10352 bytes
font_01_sfnt_off000112d6.bin
d10296df23c6c73509d3fb8e75f0975c08e785c798caa55317855fbc7354ffcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 16844 bytes
font_02_sfnt_off00013ee1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 16792 bytes