Malicious PDF — malware analysis report

Static analysis result for SHA-256 059f7441a1c4931c…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 02:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a0b188d419c4b4b2369d96f8a71b8599 SHA-1: c3d5a7167ebb69fdbedc9a40dc6a4a6522625a4d SHA-256: 059f7441a1c4931cc76141ff2cb247efa887d9db9e6798086d38a8d397fc1dae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve to distribute further malware or engage in phishing activities. No scripts were extracted, but the structure suggests a malicious document designed to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5b82efc96edb3dc43543c3c69f52ee46/bizejab.pdf In PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/df17e63d2e9f458bdad1506995326835/14265974280.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/12765099205.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ab0337134---97824635979.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb0779823---13261903933.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/46122034183.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/40206705038.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d86d38773---rakazun.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/13735049035.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f3ec295c75850f530b44fd1af45b28e4/tafadexunakituner.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5773711b---89493132949.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ppkgnot01eq2v1u81aej374a0m/96968137421.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c8a9b662b68c1d26f28ca775daf8c7bb/zedomipisa.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160786a5e77d48---gevefedudozazigiruz.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/wedoz.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/62330324493.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f9bf9f48abded5b461247417c35828fe/tufonijinedojeweni.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/93390945358.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16d993bf2---31595640358.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/wepaziteviwefudofapanima.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/kolalimojewigiwuzedewot.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c1f598106---vaponejazelolulowida.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/sbtjguti141opg6ofbnj2it471/72480580759.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6q07090f3uahukof08323fe0hq/71633541106.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/45283819879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+mantine+surfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 10504 bytes
SHA-256: 17119b393d84956305f476d42f061aa335cb92e0031749f69104baa7b2c7fbb8
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 5104 bytes
SHA-256: 219a582878c841384a947f1178ffa8b35a51cc194f5284c4330819ea12ca618d
font_02_sfnt_off00011a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 17816 bytes
SHA-256: 476667712f8306646626110a56e13ca8df6d4839e54b64a3986c74d954f8a61e

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