Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b88410f8f9f93bf…

MALICIOUS

PDF

109.0 KB Created: 2021-08-09 18:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d7851e8df5dac49a9c871685fa38554 SHA-1: f0560c5c368e8c836b940d4a0f84e60fadd42954 SHA-256: 1b88410f8f9f93bfc2d72afba5b94e9a8c99d3871608b8515783e03d3d0460b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to websites hosted on compromised WordPress installations, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the prevalence of suspicious URLs points to a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609859fcdac5e---zuladutagozoxubulemo.pdf In PDF document text
    • http://cungcapluonech.com/upload/files/55576938838.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/98284407616.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/19915670930.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/ronotoresabikeg.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107212042458455.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4fc75c1766c1759ad78086f148938e89/5138758621.pdfIn PDF document text
    • http://klefmarken.se/upload/file/molilokedavabujo.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/zenawuvareze.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160832024545d8---wosipuxiselipofub.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bfbc727ef---kofaxininovisu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a05c56a5a55---88483171882.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4606b3c629---10482613544.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qi6oe0248v1d9gdahda70vjo5r/54822459280.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/68099815159.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210615_77E2D33ECA2C419A.pdfIn PDF document text
    • https://pellevah.com/upload/files/xezoneridoj.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/633047593.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/vefatexomigom.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/83b863e8b8008979bdfd83aed82fa5ea/ribuxilagivajidog.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865eaea18f4---wikakefizafijuf.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/rabelo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6e93d9e6---zojovosiwulavavuwu.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/relofow.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b89d55e93fa---38031382334.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/ximesizizigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=yo+piel+didier+anzieu+libro+pdfPDF 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_off00014522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14522 10508 bytes
SHA-256: a4612c1a95a844b80fc98197a3dcf9a5bf91681470a24a413d4a6450b0c2b9a3
font_01_sfnt_off00015cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD7 18320 bytes
SHA-256: f5e4f03d3ee909b7375c9c3a13b72d09b0fc8980f4aa763a4219b1a97791c205
font_02_sfnt_off00018b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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