Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5631415fb2d8b8f…

MALICIOUS

PDF

74.9 KB Created: 2021-07-03 18:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3b6ef55031774b55ed7cd85122762a1 SHA-1: fe968b148fd3c07bf6ccb09bb48748f0af5d2766 SHA-256: e5631415fb2d8b8f254908d3ed06c7e7bf26adaf86e150304aabc1bd4eb282ab
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to host malicious content or phishing pages, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a28de34f---rubedunanus.pdf
    • https://brahmagnanam.org/fck_uploads/file/lebazufewufe.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d07ee2a9352---dufirase.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094223e75d8c---salobeganeb.pdf
    • https://chulintemple.org/CKEdit/upload/files/zivinidimazavipazet.pdf
    • http://dalboncostruzioni.it/userfiles/files/kimitu.pdf
    • https://uleshuzataruhaz.hu/files/file/bemavodakefuvenuf.pdf
    • http://blbr365.com/userfiles/file/1621009125.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b85471dd9---megusudepemawugu.pdf
    • http://mayamalay.com/clients/874202/File/rubomapisimodoxu.pdf
    • http://aexpress.lv/index/images/up/file/kibag.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/10sv36g4cft2gdrc0ds639o2f9/9838441645.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7d57vidh9rgtbog0eq2dllpgse/liseseterirerezuvo.pdf
    • http://duonglaohanoi.com/userfiles/file/nawekurubagezisubifuv.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d578ed4610a---dumifunafigikej.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/479d7fb6ed6c01ae31432fab86a506d5/rugiviwajuwuberegapar.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/86459fa17a9cc41c2c3bcf60cd203c48/68208203790.pdf
    • http://colafranceschi.it/userfiles/files/31271511948.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/95j4uvfij1mj7h9oaa7b7d8ofq/65019243590.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f8f826ec1---30942438069.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979d4c030e5---31812297191.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q3pi6s4hjfci3smam5jtcoem39/15651747477.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9a6f62e1994680686b9966ed5ec04c2d/83904895115.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/fitilitazaravekewofaduf.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a629ca83ee7---juwenatajoru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=guilly%27s+night+club
    • 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_off0000c2c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 16792 bytes
font_01_sfnt_off0000dad8.bin
a60b12725e3d1ca9269ac4c965345f8e93879f2fe5333f2c130a626d47123ae5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 10420 bytes
font_02_sfnt_off0000f275.bin
c02ddac5dd5d8ed20d749edbefb0930266c6dad7301289bac6dc0147b7f7793c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 16924 bytes