Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88584b96e797d8f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 21:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b33b766636b907a2cd6a48c773b3eb6f SHA-1: 5ce040793e5b59989e23db90f4ce00bb38417ba9 SHA-256: a88584b96e797d8f610ce6028d7943d07d4b47b10416dc18884e84f00a3378ae
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of many external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nusantarabet4d1.com/contents/files/nisawarawufivulogovifebu.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xokiko.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/86692279077.pdf
    • http://lnianemarzenie.pl/userfiles/file/wafezekulodad.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/jojidojenop.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/34d0920d2265106c40d71dd12cfdec58/74828793628.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410ab7a7c59---dofenifesiga.pdf
    • https://nabsangram.com/userfiles/file/14097411031.pdf
    • http://appextskihjthj.handysociality.com/upload/files/58729002167.pdf
    • http://unibeauty.com.br/ckfinder/userfiles/files/39976936325.pdf
    • https://otoform.com/upload/ckfinder/files/60572734509.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/eff170e1588f3cb352918a7f3884a562/vikuxa.pdf
    • http://www.ecostroyservis.ru/File/61603460243.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/tumud.pdf
    • http://colantuono.it/userfiles/files/29350100892.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/82311844704.pdf
    • http://zentrumok.com/userfile/files/52868028553.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f35212a4d---zogalowizabodag.pdf
    • https://etadelloro.it/images/file/tagakivetifene.pdf
    • http://carbontuning.ru/file/popizetotaresubog.pdf
    • https://jagamimpi.org/contents/files/48155588198.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zibituti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=keep+your+head+up+chords+ben+howard
    • 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_off0000afb1.bin
2f39ea3ceb2a19f8f73a5bbcd8ec6270d2aa8619af76d7763ba5c5c18044c9a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 10804 bytes
font_01_sfnt_off0000c856.bin
af0e8b6c215ee78fa33c1723df62f11d8bf201519346ea68973123a17b9cc6ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 16796 bytes
font_02_sfnt_off0000f45c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.