Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d942f2f53c02b8d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 16:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07d7d09ded0f8342f115ec722becfd02 SHA-1: 099f61931fe45e77e346e6edc24f228204093d76 SHA-256: 4d942f2f53c02b8dfb3689da01187c1d4e907316e730333a3346959a6778cc6a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://krisoc.ru/uplcv?utm_term=ts300+temperature+sensor+pdf PDF link annotation
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/88d9443b6b6537debfe045a987f70d1b/dubawikesi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/cc900bdba657330dd25a3d5cc0226c1c/95725561792.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/wizijoravenudetetetumeju.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210825163204.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/somowujuxedekalelerovi.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/vokavezerojokepul.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pevivivufebogijax.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/93024658097.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/9876221025.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c7a653ba0ff029de9679e2e7c8a72593/32540125787.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210706_45FC93E854176254.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/39243519475.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f650dfae8a3---190654525.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/20834492140.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-5/20210605032553763164.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9e683f08---66498519524.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nolujurunugutavip.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/91779208531.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/vepudowizirinawubax.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/66460ee6628aba84ad7f460809f42308/76544215382.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/tozofuzola.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/sawabemopoxatezot.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/mifogigajopeledamodage.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/13038354039.pdfIn PDF document text
    • https://guijek.com/userfiles/file/jutatemexito.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/vidozudozeb.pdfIn PDF document text
    • 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10876 bytes
SHA-256: 432b6a555b27bb7ca9499acb1bbe0d5d57ddd6645c5c9729720751eab24326f9
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 17400 bytes
SHA-256: c1d1499805e9c4a809da085bd74781a3742fdbcef2ceea9e54474c6969c23a40

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