Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26fb659926af629…

MALICIOUS

PDF

85.2 KB Created: 2021-07-10 02:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a282ce91b4f1ac451210b0cdd0c56a4e SHA-1: c6253e4555e0d7a72f21230e6233cb29d319edd4 SHA-256: b26fb659926af6291d500e0ddbb64c94a8ee55d4881937dfb49be000cacb617a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607365a8ecb5d---21752649098.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e55438066b3c2f17f8497ff5d1b9d9b/68804680248.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/bbd20d54ed43af1de0438e1d530ddc7e/15988902862.pdf
    • http://mides.vn/images/ckeditor/files/62401370051.pdf
    • https://promobryansk.ru/userfiles/files/dunevogigavezazevosokipu.pdf
    • https://daismene.it/file/47573861320.pdf
    • https://sasalidayanisma.org/uploads/file/wifawetalixovagamejok.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/panonetoro.pdf
    • https://najlepsze-w-polsce.pl/uploads/55441296467.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b839a54bf0b---gufuban.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/45441015638.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/tlhic5o5vmc6et1dl9njut3php/rolifisemuxe.pdf
    • https://alshaabcoop.com/userfiles/file/nisadupubikafaditiwuduwub.pdf
    • http://thaiboxes.com/piceditor/file/25480247488.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7af7312cc25ea113d127c70fdc1b2a59/vodezibesa.pdf
    • http://homenet-spb.ru/userfiles/file/24963795435.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/df85e2a3a2054b7b1dc415a657525696/37408412198.pdf
    • http://gandolfiarchitetti.com/userfiles/files/litipedosuxuvutoxam.pdf
    • http://faradtvandor.hu/picture/userfiles/file/fevamajetunipoxevezab.pdf
    • https://almuhja.net/ckfinder/userfiles/files/mupokegiv.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tajetimexuwinosanolitobuj.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/99650090039.pdf
    • https://davaocarrental.com/images/file/kazara.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/859c29eaaf0aefac1f51339ad0951887/38321461326.pdf
    • https://info-jimukyoku.jp/lot/upload/files/tiwekulijilapoliva.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lvppjb1oi68rmtglmd7lvukir0/nuziviz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=instant+health+potion+minecraft+recipe
    • 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_off0000e888.bin
f1b79acb624dd2a0bded554eb3b42c9982c634762d5d3143c3587cc136434f6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 17900 bytes
font_01_sfnt_off000116f9.bin
1c933e798a3983fdefe2531c92793f83f5d5a8c9a20c889fcd9d007cdf041a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 10696 bytes
font_02_sfnt_off00012f48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F48 16792 bytes