Malicious PDF — malware analysis report

Static analysis result for SHA-256 38750aead31a5eba…

MALICIOUS

PDF

75.0 KB Created: 2021-08-28 09:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 889ceea648d7d7791e7e3bc99b0f2203 SHA-1: 2825d42fb45074a55b5d40f39231948d28d1e676 SHA-256: 38750aead31a5ebaaa6adc228cdab6a175d987e5cb503ec1e7d64d423420f97e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=irrigation+theory+and+practice+pdf+download PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae0027c1c0---lunuvikumo.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/dumovejekomi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e4e240be5d61b200617009c2f0c168c2/vajurekovi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/fenibofodexifaragevenejor.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16088d6c9e4c0e---gevupifekixisuza.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114b5beaf586---jalakaba.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161165c577d288---zafizizu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/08fa6f153899d743cce56bec7ed8f68a/18143976981.pdfIn PDF document text
    • http://ezibra.pl/upload//file/72112758394.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc14cfbac---88883608440.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/sajubaninubuzukinidak.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b702102c13---87489526852.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcdd25c02---jolusipuge.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/xigorapajuwesukalaleves.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3adf84c4f0---famuto.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/cfc608a082eb4be8b83a7e44a200a642/rebejitukito.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210715_042326.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2077c5d555---10952295303.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/gepigulilijinega.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/66276974119.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0db0285c---14997412320.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a591e41e3dffeef690206a6ed0dd2957/jirudogugomubunageg.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/kosakodekapofed.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_off0000c24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24F 16344 bytes
SHA-256: d9c64219efb475bd49c0c867258d0f4f284f136e7f73b5fe6ffb7d6ac3d4e33d
font_01_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10880 bytes
SHA-256: 9dd9bc2e66c78a2915ce99584d086e43e27859250f0a80650bdd28b56326f271
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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