Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb23ac681101055f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 06:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 594f8f332fa50d4b6fb356a11269ce0b SHA-1: d97f48f7aca72df421c9acbc707885307c5a945a SHA-256: fb23ac681101055fc76a8a6bc88b6c66d7ae57c57bf1289e61d5b34dd92365f8
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 identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the detection as a trojan indicate a likely intent to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ijtm.in/userfiles/file/16795275599.pdf In PDF document text
    • http://reelproductionshd.com/userfiles/file/99221321359.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/desepexipukoxijeto.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/eicdlk8cp6jeao7ta44iojv225/sotigutelilunogotegef.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/pibebimolinifaduvuxuf.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a7aa005a97---xipaligiw.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/xofusodokajutibu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/97840392302.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/8045710315.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/5978475965.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/wiveluwuteturodubezili.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e52cccc7e4d---bujexuse.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cdee41b9c---xoridajolekopabewixuv.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7c648ab877ac698bdea4d59fff79c263/dunumepemepabakabojobiko.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ebe7d1ff85eb95d0302eb2eeb34a7da5/nowotok.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/jikumajax.pdfIn PDF document text
    • http://livestocktool.com/d/files/gozijamivuzawexaxonow.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd46acefd29---labonosefasafena.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608891c44b7b5---woxibotimefasusugizibu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9b567a4649ebaf8ecaf95dde557cf960/96669661544.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/55ulvapeb392epkorggf1b9m4m/67643269300.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lj93n627k2ltbpcsm1gpaodg46/56232522329.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/16938319852.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fd00c3c66dd1e1e551f0521a8f9b1823/18884022017.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/109256fadc5061473df70acea444ebd5/nuxuruxozigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=power+system+notes+pdfPDF 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_off0000c904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC904 17788 bytes
SHA-256: abe22bf44bac3a4ac53d18c6bae2a3e943dbb53eb9f510a61698de49f2696480
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 10560 bytes
SHA-256: 4565e8ff4e31f12a3af99b58f10f38504e021d173097df6536acd1e80bcd442d

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