Malicious PDF — malware analysis report

Static analysis result for SHA-256 f376e6c62c8ee213…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 10:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea166fe14cd2153a8695590e0ae71dda SHA-1: ab6fc9806bf828428c5edf1a62d394b8773b9e7b SHA-256: f376e6c62c8ee213c71f764ed5a98af94acf4726eca958474771cb07dbccf08b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, characteristic of a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://dlastudenta.org/Upload/file/46084107356.pdf In PDF document text
    • https://universal4shipping.net/userfiles/file/vulevivagubonewevu.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/67761646826.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/jisiparipomubewerakub.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1hpejg0kh8gie6j9pfg7tq2nph/rivibuwuzelo.pdfIn PDF document text
    • https://yellowstonewildlife.com/46905026444.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/wupaselumun.pdfIn PDF document text
    • https://pisausakti.com/contents/files/63507145787.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb910343d4---85669197014.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/gutabimopoxule.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/85220458777.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/57131407072.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l8hkce3dvcpr2h5fkkut6vgh17/wekibesiziputi.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/82249242154.pdfIn PDF document text
    • http://youil.org/userData/board/file/nobewinedukafala.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/gowabunufivem.pdfIn PDF document text
    • https://miet.hu/kepek/vegojubefeluwedinajewed.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/58553974512.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/99548991752.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cf3063053e9c9d767bd16110e7f866a1/fizobegizuwisikedaxebi.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/34140769958.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/kijoboxupafaxe.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mokowedas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shadow+fight+2+shadow+and+ninja+fighting+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 11168 bytes
SHA-256: b6f00d0df62245e7be594ac0fd4681bacb666d17af84db16770bbb6fb4e19602
font_02_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 18120 bytes
SHA-256: 83edc5fb3fb0f0a78f08ebf94cafdf2d53b0be1f877927f48d0a04446e04ce9e

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