Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e158df9f3771b4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 18:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3532f7190b82b41f1094ad8445517620 SHA-1: 23211d7e42ed52c210f17f85672b53f4f78bfb18 SHA-256: 46e158df9f3771b49aa2f73d4db18b37c3a4d397c30ebc742fe4ff5b12917dfb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs, including one using an IP address, suggest an attempt to lure users to external malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://compsult.net/userfiles/file/99952603670.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4d64226e---mutefo.pdfIn PDF document text
    • https://cmoretv.com/userfiles/88700163201.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kiwovosuwuman.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/bemominotivosa.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/35288317220.pdfIn PDF document text
    • http://adriennemason.com/assets/files/rosisebademibekog.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/jevuzibasagibupawira.pdfIn PDF document text
    • http://blueyee.com/upload/file/201848437173.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4237a388---vaziwi.pdfPDF link annotation
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73c3144ac---5720967071.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160769061e1311---beworifekiman.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aadf1ed519---34561766855.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23c7c569d.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c871c4dca08---bebabinetevatumuwine.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/wudafere.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/54ccfdd9d562a5a618f1ca2cc0319596/ruxojixemorepiwudu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceafd6109b---tovabuzeluximejub.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e505acdb58---dedizowekesupaxasegi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af21516c334---zapobivosijita.pdfIn PDF document text
    • http://yilip.net/userData/board/file/kuroxobewivixo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51f8c092f---19555062291.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/febozetemanorazasavanazi.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/jetapavewuvogixa.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///97389302177.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/puxisuzokisivinufixozafot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=royal+purple+manual+transmission+fluid+hondaPDF link annotation
    • 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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 17916 bytes
SHA-256: 57d940c289a0fae6a36088e0925d7d810b7ac0a9c40442ce39a536b09a628038
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 11020 bytes
SHA-256: 887b0d736ab15b5598e05828237c1b3fe4956e755cff71b637e21e3a04a57764

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