Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85257deccd44c0f…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 05:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b6dc210c0881fbe33ea8dbcc387d81c SHA-1: 4684479155fe960f05dcb4b46733c7c20b9af864 SHA-256: d85257deccd44c0f0e01ae01747838ccfa72d6ae1990e30902e31804678da49c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other suspicious domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=foods+to+increase+white+blood+cells+and+platelets
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1413d87667---rurubilovujud.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3b9f9273bf9ac4937c0a9b06643205b9/vajebajo.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9ba57532---fegirujajajamo.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/kejovidirowuwugujesefem.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/wevuxivejifedudonemesomuf.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/vafcnur0f8knjeipd7qrt95ms6/69128505012.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be71d9231---nawijitupagakoxa.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfe789f86---58150129448.pdf
    • http://bielwod.com/userfiles/file/botujipukas.pdf
    • http://www.aadhar-interior.com/userfiles/file/zalululepapupetow.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708a69789f5---vaxuregiwuxus.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d90f00f755---vetogiwi.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0280934572---wapufotokunujefi.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f5a17c9f---filejatasuduxetofu.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/12250646190.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2d2c6a2486cdfe12cf7a032be668b469/rumozejuwogowadeba.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f016b79dcd---vanavoxekezava.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8966d9cfdab187f313f06a48dc15d189/zesozevarepa.pdf
    • https://fertilizergranulatorprice.com/d/files/lobove.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/venopuratotanadiz.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e3126aa99e0ce58971083ad6bb07d7bc/dezatuvubawakiwesonilu.pdf
    • 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_off0000ec03.bin
f252fd301b58a3bf95d1a3758591a0add0fa1f0a0dbbc50c0917a0c838119c75
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 16268 bytes
font_01_sfnt_off0001162c.bin
e6e6b74b08b1cc4e4aef1e378dca7280614a3ec0ecc705051116b6c69cc10333
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 10816 bytes
font_02_sfnt_off00012ed9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 16792 bytes