Malicious PDF — malware analysis report

Static analysis result for SHA-256 a787c6009bf86900…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 03:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5bf23dc171013fdc344a5eb47c463b61 SHA-1: 53f4f3bdd9e4d41be7285c2142e2168a03f825c7 SHA-256: a787c6009bf86900c6f08e580cd21771bfdaa90a20728543db3ebb197e518838
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dl4qhpksppho7ndq7ed11907de/rudimimojaju.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab67e1dc47179d39b12e041d267f21c3/26255166508.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c01e4078a582c4618231ea4c8c581eda/bejafi.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/zulumibobarotasowavosifir.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/5dc34a94bc5ebf1917d35324fc460e6f/51054932368.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16089f51d6e21e---44728164698.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/07b9cdcd80fe1899fcb8e2edf9515484/14845940597.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/47405637362.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0da550c80---9108960231.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/dab96ad632d4c7fad1b694ff205470f5/tezuvadeb.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c5b34078---ribefegilif.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47b9b4cd8---11122914837.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/1kl4dionn24sabim35svstf8kn/1446718176.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/74727324507.pdfIn PDF document text
    • https://soechi.com/userfiles/file/rutadoxi.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/nafefowosibosexosurufej.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4881d4bd---53762709968.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nikifelivo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/wikotafolawimebo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210529112128537.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o6jesi1g9g4gi7gq4spa111ha5/71773470222.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0699e36ce---xukimipimanominimujegi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2of0s8neo230b2gum6s6b2dgfs/87374676600.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/50287246786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=einstein+theory+of+happiness+pdfPDF 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_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10648 bytes
SHA-256: b333b18ca924c634908c081f3a040da207bd2e88b66f972a77fd903118e68215
font_01_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 17688 bytes
SHA-256: 06196b12cd5ec4f88091924b51853af2f358ec3c18870c2162978af36c1f44be
font_02_sfnt_off00013559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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