Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee5c34a10abd130…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 08:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28d4df4a09a83203a40e3441e611257c SHA-1: 1e7783aecb743658cac5a05cb5d4effff12628f4 SHA-256: cee5c34a10abd130c58ba9fe66456cd039ded332f7003fde2668f9bd60a14153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613571db9c3c1---soluwatateluma.pdf In PDF document text
    • http://ateliergermain.club/sites/default/files/file/mimexuwasijobopi.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/kotiresiwigigexazatukinir.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sodanaguvotenolodurop.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/77307671308.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/cf7b220f3bcd86d7e30f70357604501c.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/43006571298.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/pekuzof.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/palusixejekolago.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/84428793031.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/vositivaluxalalokif.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210908184836.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/90984663196.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/zevozobikinujimuzuxes.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7a0e39f03ffd74ffd5ea5027619aa014/45561365041.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/dijexiwofunama.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/lubarosefamofiv.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/80389646266.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/44992281071.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131467cb7da3---50036542175.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/zizijasitubob.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/sirolaxeneno.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/50415544353.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/44047369693.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/lasajenikerisugifinenoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aurora+store+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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 18760 bytes
SHA-256: e3dba3b3946a13ec84381789e21390c8a68c7a18fecadbca588b4e2d233bf52a
font_02_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 10176 bytes
SHA-256: db0decd80c72f6bca015434667c7772dc1f066eac6f9d88f47cb90fe89a1c7af

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