Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ade4eaad29792f2…

MALICIOUS

PDF

75.3 KB Created: 2021-07-30 11:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79a3772063fbd30a5749dafcc192a52c SHA-1: bc8980153d5fa85f5c4ac17d4268f1bdf0eb4ab2 SHA-256: 1ade4eaad29792f28676ab175789cddd68e5f4061f55a4a840d0ca65ab944f01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which are hosted on compromised websites and serve malicious PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607448650dd07---10163822397.pdf In PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3ac33ac3b7cf54d18b4ce0abab18e1da/84607030056.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/rarumada.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/sifidu.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0c1edc80a91f0fe6e312b4feaaeeadf9/dajufubabefavi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b71cb51b3f4c0bb49de65413daa060a7/gilunuvavolomifu.pdfIn PDF document text
    • https://activepymes.com/pub/file/rupiv.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ee2c161d2885bdcc617a0065b54c4934/vebom.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/mutaxazuvisatenijofozake.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/23524401081.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/wexasufewasanazigoz.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/bixoritigimagot.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/75918391822.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc19f3b8b---xewizudurep.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c8db0c42a---73471820986.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762a94917c2---98219167572.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a36802df87f---vefoxibe.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/66893430099.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/rutizufek.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/44878440968.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/vipoxizetebal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+convert+square+feet+into+meter+cubePDF 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_off0000c2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AB 10980 bytes
SHA-256: 163e20c43762b1977c1f3e7f3f39f2ab04b6a92cd4b4ac3a3b6aa1ec4dab3a87
font_01_sfnt_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 16436 bytes
SHA-256: d897f9420452131c304552e00be724dff42cd3c2bfa4915c8a74db69634c1a5f

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