Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cacfa6f06eb4b4b…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 18:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cd26a29f6b6034532c992b19b81927d8 SHA-1: 9f57beb4de57eda01af9e575dbb8a39da839acdf SHA-256: 7cacfa6f06eb4b4b18e8e0c7f673f41e4ad76a448225ea954dc2301ccc6f4f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to lure users to malicious sites, potentially exploiting PDF vulnerabilities or tricking them into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607104c5213b0---18720786627.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9a4f2891---xomogibumaranagisixelofe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/04986c12e27f47731b1aa1726e011252/19388594329.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4cc092ef8c5ef24fda6fb6d4bf5bf386/88713640589.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/78m28qaju5bog22jagd1uassvn/81666594501.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4456a82dadbd2eecf87211c64ff02ba7/losoxig.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/zatidumuvogirakade.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/95cc74ab65c69e45142aedad842eedb2/93660787973.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/tesivenixewugukelufebuw.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b75963de3---veforetu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/81f7750e408012220a2f3d7563a2fb5f/kawotafarob.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pu17tfpgeq9jk5h6qn0qj3mq07/tetezosonukog.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1afcdeeac35cc4bce80e511d4c0bb5f3/42357108174.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ae7934be---pigiwaxapimusinimimi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7dbfdad912a9685b2f4db9c475ca0ea2/luxarekefunagafotisuvele.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/66271937440.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/kf4pp9j7s1725rohnum25q6fs6/juvirowefiloguvezivoniget.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/18446454859.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e52c157bc.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/50995903842.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/77653818947.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/84212427675.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c33f75abecf---34439055180.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1df7d880a---pufofuje.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd300f075---mapokedutugak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ncert+english+book+for+class+8+solutions+chapter+1PDF 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_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 17252 bytes
SHA-256: fcf7d32909707a47922b0c7d6ab974fccd4bbfa963f83d867f1950357b5b6853
font_01_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 11328 bytes
SHA-256: e67804d86b710351f55a5a42d5ccfdfcb104330b7aa7508e736b70dc162c6af8

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