Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc17dde172ee79ad…

MALICIOUS

PDF

77.3 KB Created: 2021-08-11 04:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee492cf5073ed9ea3bd6690939d04d86 SHA-1: 3b9740edb075463778c9f524a2a23b7f56e3a625 SHA-256: dc17dde172ee79adb157131203c6253e0428c51026003903ae748eac34602a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hayatteknoloji.com/webimage/file/dorosakuvufokafaduve.pdf In PDF document text
    • https://skatrip.com/basefile/skatripcom/files/1742403051.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/73376225901.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rasasaxavinisapu.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/48754453435.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/6747948096.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b32fb9c67---36649465408.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/24347211071.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/ea0940687cb2d3897347b43f4d3fb0f6/32631304490.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98c50d92e0---37954974725.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/79686459618.pdfIn PDF document text
    • https://isosklo.cz./uploads/57790635388.pdfIn PDF document text
    • http://soupworld.de/upload/file/61686838897.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2a7655203---nixoxe.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wivaj.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/fileviluvon.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/gibofotevazexelufoxaredof.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/85271624587.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/nopejarerofosobafanif.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/42865665714.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/28988736545.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/30620162748.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ae4c2638403d398d418b29f06b27f2cc/fisoxanelugoxifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=singer+simple+3223+manual+danskPDF 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_off0000ca9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 17464 bytes
SHA-256: cf880b3c86b0317f275899823d3b2dcd6998cd4c2049ee784cea40602b435771
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 11076 bytes
SHA-256: 387a7d022799e518871439b79539a26077ad092ae3d22be1b6100cbfb9657256
font_02_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1