Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac08eae243b7f40…

MALICIOUS

PDF

82.5 KB Created: 2021-07-28 13:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 885b58457e0172c0330bf394a5a6331d SHA-1: 4d9a9173296b45e252f07b9ecc2b9906e16487eb SHA-256: 7ac08eae243b7f40723ba145bce4f85134e42e0690e682a8b30461b5ac8593f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised websites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple links on disposable or compromised hosting suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://iwishop.hu/file/gagafo.pdf
    • http://babyindex.nl/images/uploads/43327825517.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fc1d1b3731b5d28315c3ebc4daeb5465/85866940700.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160794163283df---jalizoduwotuzaxamijej.pdf
    • http://chiari-web.com/ckfinder/optimist/files/nenurilupurunum.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607753d9d8c2b.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/kowemunavu.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/54a700759357a8fd6431929c2c8de139/nufisinis.pdf
    • http://korealabels.com/ckfinder/userfiles/files/11235047152.pdf
    • http://brmxn.com/userfiles/file/20210518210421_z21k9h.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b32672bf59---85957344106.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c4ffc7711---bunixusazukafowefuk.pdf
    • https://moveo-sport.pl/userfiles/file/89820563206.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c7530a092---60468947197.pdf
    • https://mb-classic-service.de/userfiles/file/8708159697.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089403d1e00c---4376515774.pdf
    • http://penzionklara.cz/userfiles/file/bebiketifisego.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/reson.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/73360914869.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/45897730718.pdf
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/fufizajiwaragupipe.pdf
    • http://amsaneeraus.fi/userfiles/files/89756831780.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ecb401dd2af50f5b06c100f97ee6fc04/50407409979.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+file+a+missing+person+report+in+texas
    • 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_off0000dcc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16792 bytes
font_01_sfnt_off0000f4db.bin
23667762bdeed96204cf544ec846930faf0d85d3853e07b2608a10045fcb96b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 17800 bytes
font_02_sfnt_off000122d3.bin
7ab4d3e1e33b57e32a08efc1ce0679c1d1db33c22566bc8c810eb9277d9dcef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 10880 bytes