Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0f4c4ce2964996…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 00:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbb36cd658955589967d47e5b430cc59 SHA-1: 873fa5564075e92dc6371625b6b6214b2e922abf SHA-256: fc0f4c4ce29649966e8cc00bcf77cf0fe91c5ce0bcfb13ca4deb99afbebd04ed
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, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be redirecting users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://alhouti.com/userfiles/file/wegomosu.pdf In PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/11076213015.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/q9mnsau3dbv7occf65o7s32a53/duzujefakuwuf.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/wiweraxojikalomevigef.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/50949929470.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/65d7bfc0b4dede965de512aeee0d4cb9/14168571665.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/64sp7s52nbmdu2uo71di24pm80/20369973952.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/dowujijuzebigotimuba.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48a76f6a3---konadenukagenejo.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/67570852248.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45fa3f813---pesefituzagosatokuripevew.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/livuletarazekinoxogus.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kakuzoleboxixifodefu.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wafedazifagiwakiwej.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/76934065191.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/damexeda.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/weruse.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/womiban.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/e78b0ttvdo383uk5k49a1urg9c/riratubivudunanidoju.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/92448350341.pdfIn PDF document text
    • https://digireg.se/upload/donopavurabololebuf.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vebuwuv.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/giseriropalikobatubi.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/66381226001.pdfIn PDF document text
    • https://best-label.com/upload/files/tefuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=birds+pictures+with+names+pdfPDF 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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 10960 bytes
SHA-256: c5f9fc02f7142c33807002f933c17055565949ddbc7df81711d1a3e88aaeaa5a
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 16952 bytes
SHA-256: cc5d7bc4e8b82196cc15683ecc9ef85289ae2c42035a97e967ff02447d9ee03f
font_02_sfnt_off00011d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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