Malicious PDF — malware analysis report

Static analysis result for SHA-256 1465c8e96d84e0f2…

MALICIOUS

PDF

83.6 KB Created: 2021-08-10 22:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8b6e438138ab92717d9afb52b94442ab SHA-1: 8cbd4655138a7fa83b3a349ea75624695c3546fa SHA-256: 1465c8e96d84e0f24e141053b9ebb6d6793136bdcc8ea1ff409c761b99b7f01f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://hongdacable.com/d/files/vodasavopugo.pdf In PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nefarijunatubake.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/fuvuwusazuva.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad88a65ab3---98324997541.pdfIn PDF document text
    • http://goref.ru/files/file/38753246993.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/91rbmkkbiuehcg1jmoljvpu3su/37361777473.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/37897071565.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/gaduxinatoloko.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/sibiguxajuzi.pdfIn PDF document text
    • https://soechi.com/userfiles/file/milupabolebagob.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/tixale.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/55f6aea79177c861268733d4b1e8d86a/jovip.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/60734898348.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/41071955095.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/51882208154.pdfIn PDF document text
    • https://masukpt1.com/contents//files/15284726182.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/xusodinugun.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c084249b6---seniwitolokufurev.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08c7ff63a233afdb092d51af0024111e/witalegenepamubux.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/nevaker.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bde104c94---xaxidipakar.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0127db979---gotokezezolejirapapo.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/bufitovizuvogoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mitologia+griega+para+ni%C3%B1os+pdf+gratisPDF 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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 10872 bytes
SHA-256: 838076954b59be897255377700600abd053615a0a6948754cc78e803fdc4f20f
font_01_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 18732 bytes
SHA-256: d903d74d95aa1c32f71e0675005dc58641e5905773b46a24f3bd709be3663cfc
font_02_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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