Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5164b546eaa0d1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 03:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e52f6b46a8393c16bddaf28915667899 SHA-1: b57afcfcce7116fb638935d44663d698de48c3ab SHA-256: af5164b546eaa0d1aa409bbc4921254ce65ef48f9031868d1c2ecf15cc61603f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of multiple links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=split+screen+in+redmi+9a PDF link annotation
    • http://ageddfjtjgrade.pretty-match.com/upload/files/morusimesosuzu.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/sopivetudizezutef.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/28856317253.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614168a6ca9d9---jirepovuvozibozi.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091006244520.pdfIn PDF document text
    • http://nktrading.qa/file/files/japaju.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f9bb4c3845fdbddd0293ca6516b3da0d/57248721902.pdfIn PDF document text
    • https://dcimx.com/files/92852138461.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/3586879377.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/89214598011.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/35505244248.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/muxexoxipupijafe.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21091723521315967363p4yavczpgo.pdfIn PDF document text
    • https://tadimtursu.com/image/files/zuwusa.pdfIn PDF document text
    • http://bastola.org/userfiles/file/63340146474.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091309210959.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mg4buhd809spl7v3ufiergr6ki/53876850969.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/kujevoxuvebovuxadawumagoj.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bajufifedilelilepe.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/29963737895.pdfIn PDF document text
    • https://sadex.pl/fck/file/69903462588.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/raxubev.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466e257206c---vejadosar.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/tigunavasutit.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_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 16284 bytes
SHA-256: 5966baba278a4b3127d6e39fb8f18343f1ae93dc05fc3b28b50bbc0427571b84
font_01_sfnt_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 10800 bytes
SHA-256: 471973dc7b504c77a03c058ed58f33b1d0a38e8da47e0e9871c7d83ecc331fad
font_02_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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