Malicious PDF — malware analysis report

Static analysis result for SHA-256 902d197f3df49d71…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 13:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dff28512a5ef0cf496e1d88fe967dc9 SHA-1: b14741122467deb2a8bd20125e3868440bdcdc7c SHA-256: 902d197f3df49d7195a34911bcd92628f6cf16c1375ea8c73bc02b87b3aa93b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple domains, suggesting an attempt to redirect users to potentially harmful websites. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://megat.pl/uploaded/fck_files/file/xugumisekisuwadev.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/v0a0dl28hpirklsliqbdlhk50q/rovametamimalofelubig.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/romuzakazutada.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/fabozeduvijize.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/77255790824.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/dac4484a435696e0f752a492cd40f889/36175578500.pdfIn PDF document text
    • http://preiss.at/upload_files/files/92645369649.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/31592082051.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/wuwokovugetuvozibibuke.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/suwos.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/84440663070.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210911165229.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/pawoverifixulorurakoke.pdfIn PDF document text
    • https://expomediainc.com/upload/file/80754035040.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/birefibaxe.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/72944993442.pdfIn PDF document text
    • https://zagi.hr/files/naredi.pdfIn PDF document text
    • https://refoca.cenacat.org/yiicms/ckfinder/userfiles/files/47538854633.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1632351124.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/16777551579.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146412526d14---78581959097.pdfIn PDF document text
    • http://gapp.fr/medias/files/tiriferasowab.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/rimowixaxovizizazevuw.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614671b4704ae---jesesiretazixo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161517bbfc257b---xuwijotalubarefixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+send+http+request+and+get+responsePDF 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_off0000b65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65A 17972 bytes
SHA-256: c6055c41bbeb67b40088a289245be23e3ef3a38518c93cf9f85d405114f6ddea
font_01_sfnt_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 10852 bytes
SHA-256: 90185498a1827d5c012b48bfb4a0a016637932564be869d32eae3ef7d22895ff
font_02_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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