Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8606ddc7ec0ad59…

MALICIOUS

PDF

101.2 KB Created: 2021-08-24 20:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b10ec0746b17a7982b441c72e2bbe51 SHA-1: 10e73854d79f1d2b8dc84516f51a4abd39bc5994 SHA-256: d8606ddc7ec0ad59385469d3363fa8e730b004b7f27d07f70edb78c7871d3a01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using disposable hosting for these links, likely to evade detection. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • 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://erdemlerkoleji.com/resimler/files/tepudavuxedagisoputupuzi.pdf
    • http://huntland.hu/upload/file/gojaxatonanivafi.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/26476452698.pdf
    • http://fcraregistration.com/UploadedData/file/xowatutosoragixo.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160829daa36281---lujimep.pdf
    • http://epoetryworld.com/clients/53741/File/14997496154.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3977b2960316144d7c284b29890e925e/bupetedolanujodu.pdf
    • http://wolfroccatiassociati.it/userfiles/files/77713686625.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24d2128cf---rilupifit.pdf
    • http://fitviewer.biz/files/file/mozirekanimonew.pdf
    • https://mytopics.it/uploads/file/47548349256.pdf
    • https://addsfly.com/userfiles/file/37916843301.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/505959cb5c3549cdbab2194acf502693/tijip.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/pezulabofujokoba.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608755da3d774---11393866119.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866a6660157---tulogazu.pdf
    • http://fapannimario.it/userfiles/files/dilumono.pdf
    • https://mo-space.space/web/img/podborky/files/32200172405.pdf
    • http://5lovestartw.com/CKEdit/upload/files/10557779180.pdf
    • https://rmp-familienanzeigen.de/cms/files/81407990572.pdf
    • https://evergreencans.com/userfiles/file/pobekadisan.pdf
    • http://monkey-do.net/userfiles/file/47359423290.pdf
    • https://dlt-nkp.com/fileupload//file/likazitexixowuruloxa.pdf
    • https://contact-house.com/fckeditor/upload/file/64924646649.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=no+rule+to+make+target+mplab
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29b.bin
c38c1b1171e141398ed89cafe2aeb7e5ff0b8f2069bd22bfcd3ef85a9377ab9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 10540 bytes
font_01_sfnt_off00010a7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16792 bytes
font_02_sfnt_off00012289.bin
5fc90addfffee80b207089aa03d8e6a2d04b318140a3aec182a8706d33044998
pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 14768 bytes
font_03_sfnt_off000151a4.bin
0c8d5c519ec326870841cd6dfca797efa085eda1df3f00eb42f5e5401ed61654
pdf-font-stream PDF embedded font (sfnt) at offset 0x151A4 19804 bytes