Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e880a6aefc646f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 13:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb834414e2ae25ce58a729ef7f170754 SHA-1: f851397ad162cb05f67c1928f6d5f7b3561c59e5 SHA-256: 82e880a6aefc646f74dc2bc3483cddc5823c432e5fa270486e53db8b62accf6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains identified as disposable or compromised, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://2b3la571ga-70p.com/contents/files/fezarofakoxuxejojow.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b6f541080---34093973231.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/08ac29e4a5658a6568fa88f47c927ba5/3738573591.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/zumalobow.pdfIn PDF document text
    • https://bnovum.hu/downloads/26463016246.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cff48c45---7505319104.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/malemivodejeludi.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/nedujozaki.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dff903aa---juwatitizunopabujapip.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/xatutivinuvalejuru.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/59336778208.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610564274a3a0---bexijufevefewufazodav.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/59370563559.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/gorevorebejak.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/94326369582.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/nuxidekarazex.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/wosuwamedenevulalukuzi.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/ruponekuj.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d555c8235f1737255165a7bf1440d669/59469596908.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210628050933.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/nifiz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c0863afbfe0f5c1a892ac2990447eab7/21094570653.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/oggful7knipd35bf9lrtab21ab/jizoruku.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/653d862d2cd475a79e30a14efc6f3813/juwowug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=haulotte+compact+14+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_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 17068 bytes
SHA-256: 0057c59d3aaa3ea60d5d39e93f3b845b4cbc44ef47c24ddbae0705b2311b17c8
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10540 bytes
SHA-256: 02aab96169e052844e788b3343bc043d26f0590bd1407f87242b9726ca5bbb15

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