Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bf81e1e6e67049…

MALICIOUS

PDF

86.1 KB Created: 2021-07-30 21:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3bc408a903cc530ee0ea2cea6bbaf2e4 SHA-1: 18edab52acf8256006dcdbad4c2888b200494db8 SHA-256: 86bf81e1e6e6704910cf77f49962254eb68a8239235a1e1df0eaf6d226c25f5f
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF links, many pointing to WordPress upload directories, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.deep2001.com/images/library/File/dowatomapawavupudo.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f73d7d6ed---72194965335.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/58718761260.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i4bpn3npo0gl8ngn0o7ruvskrq/pubudonegasir.pdfIn PDF document text
    • http://aimic.com/userfiles/file/27869390465.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/podunafusi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070db54aa993---varupokegudomonibewut.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/34d81f8791825af500c401587f80be37/90334239645.pdfIn PDF document text
    • https://codecs.ro/images/file/55316516714.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/81628011603.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/icabdmcbhno1pgcujrjf1nonoc/86032245974.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/35926716345.pdfIn PDF document text
    • https://dineflon.com//files/15062647306.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608541a439c81---popolenimojevodo.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/nuzidapepuxedobe.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed09c61f95---zizolobomapegukuvet.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/pazika.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dcfb52ae---livoberopa.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210720_3FF1B063D277F22F.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/98408363095.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qa6nhre6eg6ugo7nnlcfg60b3t/sexasurubara.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/kadomikoxajemanaxef.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/omupcrkam8mhra0e1gpgtkkeh6/57514051595.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c493600028---62123680511.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vqrci70fsjuqpkvb0vjumnenlt/kimobodupefakuduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=itext+html+table+to+pdf+examplePDF 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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 17692 bytes
SHA-256: 0802115a49b94195624b9d1ded0fc573fbd21bc9c76bd5899ea1cdf9d457291c
font_01_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 10492 bytes
SHA-256: 3501e772921047459e8756b02f8cdbfc62ee8895ab5d50ef73d629853431e2d0
font_02_sfnt_off000130d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1