Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b611aa8e29e3eed…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 02:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f96bd336b6f988735524f33f010a289 SHA-1: 054ac08af1f8dd6766b151791794a47182de205c SHA-256: 3b611aa8e29e3eed6f0b47953538eea982032de2c89b63849b0279f83040770a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are typical of a malicious PDF used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bigbazar.cz/is/images/FCKeditor/File/jajul.pdf In PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397832ed494---20491562191.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/fixasolirif.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/8854909648.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/59202459935.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/sovoreruvexujejeva.pdfIn PDF document text
    • https://kultmotor.hu/images/files/37065682783.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30945360248.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/wibaguxuninavudipa.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130da1c24dfd---rumip.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/57885287658.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/3593611156.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109091525301299.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/refiveboniwadeporanilesa.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/vebewojijorimitiguxabow.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613156eee9222---165619790.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/famev.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109041659008907751hvw69.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/42603413613.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wibumakiwabapib.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/43226770707.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/46861884320.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/58219594675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cricket+19+download+for+android+mobile+apkPDF 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 11180 bytes
SHA-256: 2f95e051d4b0ecdc306f1691f1d316afd15a656c19aa754c24ae3a1d0faf7dec
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 17520 bytes
SHA-256: 67e1a18a561172d17bc4e42ae04455ccc75628030983215e64c4a2f0461dc1f2
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1