Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fb01947ad89f45…

MALICIOUS

PDF

81.7 KB Created: 2021-10-12 08:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f5bedf1a84c821cfc378cd53ceeda9bf SHA-1: b1f9e854999328706e70324e64ac0cf35a8b221f SHA-256: 40fb01947ad89f45a1207bd656abdb1bb015cb5de34754a14a19af93cd61215c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs that point to potentially compromised websites or disposable hosting services. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aircond.md/upload_fck/file/kolofuketukevafufule.pdf In PDF document text
    • http://svsteinfurth.de/radsportfiles/file/koduketasemopufip.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3d83d12d777a25f1d95356640fc9aecb/63680196408.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20211004223244.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135704eead8f---nizumudekusivita.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/82313215111.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/86034672603.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/fofunutado.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/57c4d2f906fe02c5a38c08b7a7b42d29/31794838135.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/10725238266.pdfIn PDF document text
    • http://parfumland.sk/upl/dijubunedebo.pdfIn PDF document text
    • https://0900107678.com/upload/file/fuzunimivemu.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/sesujepezoru.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/fupilevaxaxuxoma.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/duxodosafojebipove.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/rezedapovoj.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/73150738335.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407f7c9dfca---xekefopupilupoxobaniz.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/jesifoxunelutulowej.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/wonizaj.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/19654674291.pdfIn PDF document text
    • http://iscelenie.info/files/file/nolawusikoduruxuwudugape.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-30-09-12-21-65.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20211011559444517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/u-9XGpgKpwY/uplcv?utm_term=grits+have+glutenPDF 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_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 10472 bytes
SHA-256: dcada709ce7bd6cf272685ca473eefea5c6aa155fd4a2277032a742216c6ffb4
font_01_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 18524 bytes
SHA-256: e4b930f372ffec8a12b1ac844822785e467a9fbaa322c98370b426bf068c23f0
font_02_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1