Malicious PDF — malware analysis report

Static analysis result for SHA-256 e831585a39574be3…

MALICIOUS

PDF

99.8 KB Created: 2021-06-26 01:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d7d68ca009df12575714cf9ccb4b432 SHA-1: 1a4b9a18e14077e143f723339e8d33e13d9c2b50 SHA-256: e831585a39574be30a6a4ae5b0adf6bb1978a51a3437005db7b9cc84c9deeda1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories. These links likely serve as a link farm to lure users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac114bf36d8---34958333374.pdf
    • http://netmutum.com/userfiles/file/14590587621.pdf
    • http://casier-a-bouteilles.com/file/pizanijebitojip.pdf
    • http://termocity.by/pics/files/wosogezogumulatevo.pdf
    • http://epoch-making.jp/js/upload/files/35777478734.pdf
    • http://assushop.com/userfiles/assushop.com/file/tonexawunapu.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/54641886232.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c489d370437---90419378664.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20284d90b---19361196253.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2d3b4b88fb0e8c89e4d2b7141dd8cdd3/92289065976.pdf
    • http://thepokeluau.com/uploads/files/vanizojekus.pdf
    • http://aj-logistics.com/stock/userfiles/file/70523690432.pdf
    • http://talleresjpg.es/img/file/61467523562.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b27a205ee373d956923f59d80192488d/sigibonarelod.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a9284351---lepoxijomuxelezo.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/11018172948.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ab089688a5431adb6c44bf295bf1f883/1347812888.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7dec6f71---kopavidoziwomab.pdf
    • https://dineflon.com//files/rafadabu.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/kezixamotabudelenizatufa.pdf
    • http://amandamaitland.com/images/file/ketivok.pdf
    • https://minegociomiweb.com/userfiles/file/37238631597.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a695ad78db45d1b4141de9244dedab07/poranikuzekafesezuguvajuk.pdf
    • http://hitecds.com/userfiles/file/355885198.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c34fcb670---noparovapusovuke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=happy+birthday+to+you+song+download+mp3+mr+jatt
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011528.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 16792 bytes
font_01_sfnt_off00012d3a.bin
c258dcba504bec3c942586b01cc14d829006d5cc2dc2e10f45c9c59a3bae12b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 17948 bytes
font_02_sfnt_off00015bd1.bin
f9065ac5d14694fd608b7750d758c6d6018f4fb308e820b0cf15976950cbcaf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD1 11440 bytes
font_03_sfnt_off0001762d.bin
5f9489db96fdfefda6296b7f3d1625c07d7946c1d71a655e11177c1cfffd0e72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1762D 2440 bytes