Malicious PDF — malware analysis report

Static analysis result for SHA-256 adaea75d2bc5598a…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 20:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe698e30c629ef49c01f19b7c588e43d SHA-1: 645ec574446b9c57a9cc8d3494d54d6221694897 SHA-256: adaea75d2bc5598a604a41a57ecb47e2b844efc5b2e3b251567261847de96617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external URIs, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://crysiq.ru/uplcv?utm_term=live+football+live+stream+apk
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/126a6f2e796d43ded35de70f98b44228/90926521342.pdf
    • http://hwayinn.com/image/files/20210905_161132.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/87938925848.pdf
    • http://caycanhtuyhien.com/uploads/image/files/73162883561.pdf
    • http://frutapac.com/ckfinder/userfiles/files/nevelaradisa.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/539fec8ad7539c2f0b3fb98285239c67/nalitifijagori.pdf
    • https://sproname.com/files/userfiles/files/wizitute.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/gojajumavinikalipezijut.pdf
    • https://makenie.com/upload/files/gubenozatukezizameviba.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/36dtnrdfjrracv2muv83n2kt45/24038268751.pdf
    • http://espicycooking.com/files/file///22277561737.pdf
    • http://adhunikjewellers.com/ckfinder/userfiles/files/43623399102.pdf
    • http://a1climbing.com/userfiles/files/lezazetopalumup.pdf
    • http://villabrown.it/userfiles/files/22689647029.pdf
    • https://mjrspot.com/fckimages/file/nabojaz.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8fee62a455c2dfa99d7f27145a535bd1/nadesixabanazopamizozag.pdf
    • http://les-dvorik.ru/userfiles/file/51375031122.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/36676582237.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6b218a781160c93a71f474823c2eadef/86429926309.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613113d1a2b7c---79133144895.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fc5e3d34---rafelokuvefujuvijek.pdf
    • http://www.primariasantana.ro/uploads/file/92558054303.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/46356394686.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346507aa4b3---xuwibupuj.pdf
    • http://tcsm62.org/uploads/news/file/50784749460.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef80.bin
32dc94247d5567a54dc87fb7a084d7a51b39809a6a190dffc120b13da688bf91
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 18000 bytes
font_01_sfnt_off00011e0f.bin
8b2f0374e155f6b36512ade97504bd8bf4c0b70376eaa3d1c3c57ec9f528c955
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 10668 bytes
font_02_sfnt_off0001365c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1365C 16792 bytes