Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0589cf6c23efb2…

MALICIOUS

PDF

95.5 KB Created: 2021-09-18 07:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: acecef5b13a52b2d29cf84c4e97fbc3b SHA-1: 76a6e8e5c3ca988afa71c1317be35a6118395bb7 SHA-256: fb0589cf6c23efb2a4dd7be377426464f00e1a02bf83e49b4b8ebe3bf37642f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of these links suggests an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164290f5af---13739674787.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3d6e0932e4b140ff34ab6a18b6487b4/vobewupofazute.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/66318548562.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/dojemopijafo.pdfIn PDF document text
    • http://mfcpavpos.ru/file/vituxevuwuluwelutifuzoz.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/34915387244.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe49457af---gojemabap.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b91ab17cfebaf0dca0f122869152ec2d/suzafeduxobasilujenela.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/35545202083.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobilapilijewozetin.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/75722953450.pdfIn PDF document text
    • http://showdoimovel.com/files/files/38413707720.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1665a9fe3635fc862542907612fa5c98/8619965395.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/19935158541.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/619650b0df797094717e30d4d826530c/25806268024.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62127614949.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/jibepofofemoxevuk.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/80966067200.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/lolabaxipusuworozadafe.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/80203869995.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/36584448921.pdfIn PDF document text
    • https://highrise.pl/file/50169996261.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c96e84d00088dcd832e5ed285c62a234/14441229821.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/45936598400.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/50947412925.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/74018281843.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae88d26f2---jazodajezetubulutepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+tanpura+and+tabla+app+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 19960 bytes
SHA-256: 557e1be854c9e3746a15e334fba4049b258e2d5231747369efa2746c242c8251
font_01_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 10784 bytes
SHA-256: a3e86731b726fcfe4eade419a36ec0ae3899fce7b0c8c5fc98e106f9960f17c6
font_02_sfnt_off00014f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F10 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off000157c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1