Malicious PDF — malware analysis report

Static analysis result for SHA-256 da75990250be036e…

MALICIOUS

PDF

81.1 KB Created: 2021-10-09 06:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2daae53240a6b623a4018386bad31472 SHA-1: 6387eb185e02fa7860fe20bcbea2e4a3b267250f SHA-256: da75990250be036eefddbb8a9bbd1332e17455133bb1c4cf76f4bf4c12df109f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://phelieuviethung.vn/upload/files/jemalamogerow.pdf
    • http://spc1991.com/ckfinder/userfiles/files/58918975442.pdf
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/rogozitalogoxuf.pdf
    • http://infoegrafica.com/userfiles/files/fobozabu.pdf
    • http://onlinetradeshow.ir/uploads/files/worubopobonanetifexiroj.pdf
    • https://manhalhealing.com/userfiles/file/goduwezekuru.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/44128237754.pdf
    • http://jar-ted.pl/file/ximivafeg.pdf
    • http://studioiulianella.it/userfiles/files/jedipimilopilupolopa.pdf
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/71281484840.pdf
    • https://stormester.no/files/file/zarobetef.pdf
    • https://alohasafaris.com/files/mapapegoforitovekumogase.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46e597fe3---75175808882.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/fitawatuwedum.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5k26hlrljoc1ck6mf113974hfg/jixomajumowomojon.pdf
    • http://chip-chup.hu/upload/file/wuwosanilarolejikodobo.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2caaa0edc373a27b01a6ba86d222dee/38698155598.pdf
    • http://epmachine.ru/d/files/pamobegozenupokowudabu.pdf
    • http://gyogytornasz.hu/editor_up/popojiluvume.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/829d5c07618a390cb84862a4e71fc3d5/49324756757.pdf
    • http://mintaialuminum.com/d/files/90939633628.pdf
    • http://gesundezellen.de/neu/userfiles/file/16333643763.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/trh16kmf4pkhal33b945tcq8od/20623371888.pdf
    • http://igigeothermal.jp/userfiles/file/66324866595.pdf
    • https://hamasataccessories.com/userfiles/files/20510550543.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+does+urban+growth+affect+the+environment
    • 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_off0000d7dc.bin
2b7db30b1c1ba1ffca2dea3c662db0f4519c26e342cb66cb0e69c56cc866c68b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 17304 bytes
font_01_sfnt_off00010433.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 16792 bytes
font_02_sfnt_off00011c4a.bin
c8a3ce8ec0b145cbb54ed8603a73889983dbed175da60e5b7a4ae3225e767b63
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 11260 bytes