Malicious PDF — malware analysis report

Static analysis result for SHA-256 0688916cb2897f7a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 964c4ac077ce1a3d1fa2a8fa63df753d SHA-1: f805a4a2f697a72578257b3cf6895900a7cd5882 SHA-256: 0688916cb2897f7a058d19b55f0d013a8e16594b41cfa938c94583092a650f31
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristics indicate it's designed to trick users into visiting external URLs, likely for credential harvesting or malware distribution. Multiple URLs point to compromised CMS uploads and disposable hosting, reinforcing the phishing and potential malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smartdeal.pl/files/upload/files/54956723698.pdf In PDF document text
    • http://alrabbancapital.com/file/files/milujuvinixubusa.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/19357783540.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9d0ac26d5856324fafb92627b96ec72c/5209231728.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109060431475658.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/39239186177.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/55378227694.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146976f2f84e---gatif.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/sotatemitugumuxowez.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1433c524---82011578594.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/vonojolixalovivinar.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613546f2b6bdc---20425669881.pdfIn PDF document text
    • http://espokebar.com/uploads/files/kawebadixenazirub.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210906190126.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/57587938670.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/vagumewenamexabuwolov.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/94303462503.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210916203834.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/bavaliresuwuri.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/waruk.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/34203409452.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/zulufavafiwufiwigiviko.pdfIn PDF document text
    • http://www.moyekolodin.com/files/11802231483.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/wazikabubidewamobesada.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/83484661968.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/38048444762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+art+of+writing+reasonable+organic+reaction+mechanisms+solution+manualPDF 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_off0000b4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 11072 bytes
SHA-256: 2c9604b4c9d38a1b5ebf8765e7445655f25f294857779058cfef065d5aed0b9a
font_01_sfnt_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 14088 bytes
SHA-256: f75641707dddb216268e7a6bf92249cdad8db2413200b8666cbae8315035dfeb

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