Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fee66d1274d88d3…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 23:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 906992a2956b43143919009d6d744392 SHA-1: 2d0b123d4c87aece4744332536765d01ef7b3de4 SHA-256: 3fee66d1274d88d36d5d0227fdb8ddfeab4bea0a83054495f228022af348f276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure victims to malicious content.

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 https://menlopark.com/wysiwygfiles/file/jamilamonolumo.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/196789c45370457f9da3d23ffca8583d/72022050075.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mo67bggbroh6cal2ephdnrjdrh/24895621850.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/tewikoxe.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3c8c4263---jewifosit.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/tosirujapomonos.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vofulisonorafupitisoxabu.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/katagujamezifuvagozad.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701811453b2.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608f37c47140e---23341083441.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/56693836316.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ckvjdug58gjhaedjvvrlcq677v/35637668928.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/65524126299.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/98552569457.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q2n13b2ca1u9atugueds39joj3/84384129774.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/54742395970.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/81639980120.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505150313858575.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdefebd4079---93768208840.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/91535556133.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c6f554096---zemazobizodapo.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/9068192835.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/70585431826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=325th+district+court+tarrant+countyPDF 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_off0000d155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 10832 bytes
SHA-256: 1fcd3363b4bb4fbf61d4568c959a9c79fc05b923f237a05a3a16d6cc41efb24f
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 17808 bytes
SHA-256: fb01fe1b16f5fb8093c461e868ebf5edef3e1a766e33a04e1407bb2577429ac5
font_02_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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