Malicious PDF — malware analysis report

Static analysis result for SHA-256 1650667c9c45b666…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 13:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2636267b3d8baf640238967270e49edf SHA-1: fe1a7db6fc811a5e0e832397ffb808f9c0c5129c SHA-256: 1650667c9c45b66603183cc8a7468b5b29e063564b5d8a57411856bd8fd34001
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous URLs, many hosted on compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://philabc.ru/uplcv?utm_term=the+vehicle+routing+problem+paolo+toth+daniele+vigo+pdf PDF link annotation
    • http://pensionpoint.cz/userfiles/files/84401662998.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767ccb0cf4b---xidoledovonuvi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121387412e27---xiwafame.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/23083985583.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/cscso5guqsmbn1s4k5980jc8as/xosabegaf.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/64507150201.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/womikidesutavusetaxe.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e43cbc1a---83497015391.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/najilizetabaliwijijado.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/2103065805.pdfIn PDF document text
    • https://digiconelectronics.com/media/91314232868.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083cab81e4ee---zumetibakefodurugebalufa.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/1951218711.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/94035037126.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e3c1acd7dfb56a4a092a1591f083926/37018497033.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/sexolifinupogonubisuva.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gabezibux.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/beramiti.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/51949639245.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/12793c4b2853b1b1a830e99c1da02a1a/suwagomabo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pofci39iu8fllb24prolk42ce4/48580065670.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbbfe41faf---bitodavebobojevisumutomi.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_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 19388 bytes
SHA-256: f08ccbc8150a8cb04581ef53e93af3ec5b2c9a10972d871270a1bf7f963e9eaa
font_01_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 11168 bytes
SHA-256: dec6b75d139c9a8a6ddcefe704fbf1845680fce326f0961c1d3af5e87567b8d4
font_02_sfnt_off00013b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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