Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7723b43c95547a…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 10:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e47cd173eab527f26e9339febbf711e3 SHA-1: b92fd18b24b25311c90c228fcd853f0cee556806 SHA-256: 8f7723b43c95547a245cbbe2c7fa101cdcd587b2c8d90b524356e70fb0465bb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The presence of external URIs and the nature of the links suggest an attempt to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=the+farmer+and+the+witch PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a042e37183a---merepitodazo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/caf500c6591ed4362f715ad6b7a019b2/kodabuvoj.pdfIn PDF document text
    • http://carszana.com/image/upload/File/86582383745.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcba9051e4c---61811510578.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba59ee008---ramut.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gazawavet.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015b369a78---xewimo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62554229675.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2d86bbb3---19174170449.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97fda19ea8---30045457055.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/59950111724.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6c86d51a---luwivezumifilaxate.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/76047870111.pdfIn PDF document text
    • http://garderoba.sk/images/_file/motuxesujerowevomiz.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/edcc8fce9a4cae2a4332da511422f13e/80146338239.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00ae2da17---50585607305.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xazelezarurigoruwapekuton.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4ae6f316dba4d6ebf6300688cdfc42bf/suvijuzanipakazigewunez.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xivedobolafalakinixere.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607998933a36b---nazijetemusem.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zubizajawolidivumib.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/xosomores.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd298014ef---wukumukaxovowemag.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcef3f4ba---54500297882.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d761f0cbc---69459259770.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/kegusetijifu.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_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 10456 bytes
SHA-256: 7d7c61915c046f5243ec076777c9e2a815dc3356050d808bb8c3d7efae1e76b1
font_02_sfnt_off00012d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 17800 bytes
SHA-256: 0ee0c149b3dfe82957d01ac8d1010cc8d4477177f7fc212313c317224f531f12

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