Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b4d20c66d4b1fd…

MALICIOUS

PDF

95.9 KB Created: 2021-07-07 20:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 783388c2ae7da17c91f65365c467a676 SHA-1: a2d3467d23324e5fd6cf8aecf2636dfd931cb304 SHA-256: 35b4d20c66d4b1fdd6bb5819199c99cec7a3aaa22340d6cc62f84c6461a6db85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=beef+pot+pie+with+ground+beef PDF link annotation
    • http://shinies.ru/img/lib/file/9660261038.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3a436e67---63943233762.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/28451544449.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e233f177---rojuzusewusaku.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/wupafiku.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///20894376142.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6411cb71---rofiwepi.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/nosilerokagovimiduxut.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2rqi9jub6vt8411h6cg5epi196/niloduwadubated.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9ltfdvacuqrohhqm75mjd6l518/ridepojatokagebovu.pdfIn PDF document text
    • https://etadelloro.it/images/file/loruzetowafetalati.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/27827291824.pdfIn PDF document text
    • http://splogservice.ru/content/file/safurinu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab16adc392---262938769.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e4eacf331---wivezulemasawasu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a8f40ab1---zakom.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/jetiwetojunizid.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/mulepudetikod.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/81398283048.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/nolaxemogivoxuxu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/14qiaj1gi836e9t4ik00s8nls5/sulomudam.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/zabefizudumonelalokepere.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/03865715d74b23fb29013c4f364b0e07/gilobadokapijeva.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/74440964303.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 16392 bytes
SHA-256: e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e
font_01_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 18500 bytes
SHA-256: 2a6198262b011c792838a55dbaa02cd3c988cc7ef45ac195f154ee13b55dc375
font_02_sfnt_off00013fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000157ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EE 10780 bytes
SHA-256: 6d591157c16eb6a973305fec138b46d02f0e19f71b88812a7b7ee4d29e884b9b

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