Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc04aa801a26165…

MALICIOUS

PDF

78.2 KB Created: 2021-08-25 23:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2708d5ccde7fc7417b0ae522a507f7bc SHA-1: 3054d4cc1e0b3ea388d395c524431ee280d5cb3b SHA-256: 7cc04aa801a26165776d6f9f4fdfc204b70e1540a8d4ac9a4da010e57a70e6e6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or lead users to phishing pages. The PDF structure and embedded links suggest an attempt to leverage SEO poisoning or similar techniques to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160981d272b680---gegutiwapesurutajexas.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/buipfk1jrjr50lp2igdan8lnim/14906867809.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a29f3989d74d70cf04230af4793c6949/44260862598.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///46256856104.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/87318036018.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kf280ui7v46s18mcj6cr2in028/zagilimajafogabodo.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/dapuzixado.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f03240a5d---41837866287.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zaduvomukogutojosivowelub.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a5f0761e1e719193e2400b90d8ee8711/tidefasolipatopekunit.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/23513805195.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9322d4b0---demelupikafemajem.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/jekug.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c579fa03e9ffe9774d82f01ba27b5592/vavaneguzut.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/nimaxexebo.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/todomijafunar.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/45508952211.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8b190aa6---kavupeburetagotuju.pdfIn PDF document text
    • https://advik.net/userfiles/file/veridaxitoxomiba.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/bivinuvedutefage.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7lu6iehs3fjj6nt3166qe1fj11/12494331182.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/77345ec670a7352b83a3b5821cb38156/muguxurofebun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tropical+hot+dog+nightPDF 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_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 16776 bytes
SHA-256: 83574c93abe66d06f7fe7c7aa0fdce3262864b85257437934c91e335e7957f0c
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 10456 bytes
SHA-256: 410abf0bb21259f173cc04bf3363f5c8e4c5fa74aef1573e417ac45891128483
font_02_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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