Malicious PDF — malware analysis report

Static analysis result for SHA-256 743ef9bc4a176560…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 21:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: daee9a7efc81279c526eb8288dd37aba SHA-1: bf0a8d6d6c4ca2ee75cd2a8d19a1f1c2c61ee841 SHA-256: 743ef9bc4a17656051926e91d8ed0a0dc0516f59e1ef1d541eff7f4063347fca
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload directories, suggesting it functions as a link farm to redirect users to malicious sites. The PDF's structure and the presence of multiple links to disposable hosting further support its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=psicologia+humanista+gestalt+pdf PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68b2afc7b---3505712475.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/bawubozupiruvezafadepaxa.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/rifonolijixiweludewon.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/pidisumevikuninus.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49887b5d95---86614771397.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/sobujokinurijuzidijis.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/denanavizobaredepupatit.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/buderafofogodejurepuwofag.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2e1483c1fe9b47c75c67fb390e3a9f99/fumufalenonorepugorox.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/zubilewurulologajidibab.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d65a22406---jiwikonawupajijolitexi.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/35194379229.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/92543707194.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/ronakedewepulelale.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/8480204626.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9ktsi42sm4q3hcv4u694ttba3f/bogalejunotenunut.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843ecc6601d---dafejalixaxixu.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/74af83aaaab6a572792ec837f5948ff3/refavoxexavavupa.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/retaxezogunaf.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/sutonen.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/331fa207ac002159c797f2933b425987/28740252118.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/94304651136.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/zesitituv.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 11068 bytes
SHA-256: 131ab4d94153ee459b2a71960a97431df351d83c13046cd380f66c35deb53b2f
font_01_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 20192 bytes
SHA-256: 2100a7fa71a882569f246a284a01b1d0b3ca952bdf7bc36914dad6a8c63dc7e9

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