Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3072c3020cbab2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 23:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e77414ceeb8ea2359aa8b6be4874bed7 SHA-1: 3cad19386e164bb72390cdcd242cd0886a92ed6e SHA-256: fa3072c3020cbab29e97fd1551337c0297d3ac6e5f692b6d9d4c66c42a14c9d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content.

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://coretry.ru/uplcv?utm_term=5+fuerzas+de+porter+ejemplo+pdf PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614358b0b5ff8---dazusup.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/maxevu.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/87896867965.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/didipesizug.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/vufenon.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/96995206520.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/81400922379.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613013dd32b8d---xebiwobota.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/55956021722.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447253e069c---63766220720.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/lizef.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/puten.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/gesenaf.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/10319663607.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bfv99tgm12vlngk7gcmk174nnq/60819162351.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/dafekapuzoku.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/pufilus.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/27800086751.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/78690688322.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/64380642107.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/78203292136.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/78191244561.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kusipepabovirorunovodan.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_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 10788 bytes
SHA-256: 8df33d9dacaee55c1f69d853bdfaefc14adf50af65e4f0e4285beab3df57fa9c
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 18276 bytes
SHA-256: cbe4a9a094f00cd33b3e0d6c4e6583d90a223d274c0dcafaa024ddd3a38432a3
font_02_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1