Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6bf049c966a18d…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 06:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5eeb01c7d7f363405f4f80ee0c45433e SHA-1: d7a7a0c3e31d7af0e532f26a6756fe014d64a5e3 SHA-256: de6bf049c966a18d1431cea6c7afab2da243c67416a053d5fe60168f45884005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites, which is a common tactic for phishing or distributing further malware. The PDF structure and embedded URLs suggest it's part of a broader campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://nomylo.ru/uplcv?utm_term=in+what+water+was+jesus+baptized PDF link annotation
    • http://helloslow.com/data/userfiles/files/1254799566.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e1c48743---mafopotenadon.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/jenuki.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f87acb3c---wibosisit.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/51736989668.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efffdb62378---fonet.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qndi85rpiovu6ofcgm4gqi9sua/41578848890.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/xedojomigazu.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/58786194496.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/52552890674.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/wadejet.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/nawavotemefisevikowoxuzin.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rtkovq7rtdu9j5s2svbp40ubvi/87421732557.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b167ba0f677---fujorokudolu.pdfIn PDF document text
    • http://whatdwellswithin.com/file/37465423588.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7b99ed889---57185585832.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/rexojewetalabivuga.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zevatiliwokotuzu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q8ss4808qfd38qg3c2rbjfmq3a/fijalorevan.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a7b369a6e8910ae5413fb5541a589868/kimaxabogusugejomizowofav.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16263510346651.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/36r8om3h4bt7oa7n713dfvglbo/67206772742.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5d532cd4018f5013e7e55133436f09a7/dugikubedufekok.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/retavuwepofufag.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/97471824987.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/11973538170.pdfIn PDF document text
    • 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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 10792 bytes
SHA-256: fbc8ae1106ac7df8f389af3419756fe15e4163978395e2ab032cbb1426237950
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 18200 bytes
SHA-256: 1868e0ec14e058664bad76e4a76e2a664ff76e5a8745ebd4035c49a7bd125f19