Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4bd537f8574510…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 07:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61c65813e6559cb69a6ffa7695361ae9 SHA-1: 903b709af7fe0127baa82a380ea0b61518d6dd39 SHA-256: cd4bd537f8574510dfbbfa0ee4322df366969744df1b84f18583b26fba2b1108
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the heuristic firings strongly indicate an attempt to lure users to external sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://praconsulgroup.ru/pict/file/koporudorotexuzelow.pdf In PDF document text
    • http://commune-bourre.com/userfiles/file/durar.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/xereroxow.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dee98a3b6---tijevuxajemujine.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6933a8d7---fevowewelunumodijisi.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4bf027001---damos.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/33697880821.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1f4c26e4f3d25e6cf98211e3bb47997b/mipep.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/bozijosa.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ml4a69bd7iaaii5u9edmpqkru6/worijepefep.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/57659329740.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/vozew.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/78177150560.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/30278041183.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/566fb6d00d42a7b6694897ca1322ab20/46246607495.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6vk2s4r2m4njvu2pekh799847/tadixanodevatawogewo.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//wobipojofugivopi.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210723_1FFBF6D95D9221D1.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/nawofifovokanub.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/zideko.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/81483252489.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/45729324e14ce2d66ea34e5c7dabbc1f/90770864821.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/womawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dispensing+pharmacy+by+sanmathi+bs+pdf+downloadPDF 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_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 19168 bytes
SHA-256: 8d5d51ff4df0e350a2dc47ca504668c566f9d4760c00336b9274ee642678c1c4
font_02_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 11408 bytes
SHA-256: 3485d7ad04e370cebd38edc3e61bed868da8ce9ca3be11a9621f4461afe6327a