Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b27988126c8e6c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 02:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bf721b6e095309873317e080595678e SHA-1: c526f2c75b3bbbb1f9a2b684ab60f60722b4bb62 SHA-256: 55b27988126c8e6c87af8b5f0cc3c981ada4aab6dcc82918ab6e48d34cbed3b1
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garnizone.com/userfiles/file/58384155303.pdf In PDF document text
    • https://cukimentescukraszda.hu/files/files/wijokin.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/kisuzuj.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/90646171355.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d7e107f16---nepuvasol.pdfIn PDF document text
    • http://ktcz.eu/files/files/risaxelapawewofewolulogo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vonm4okv6fbj81887n3er2c2h2/jinujove.pdfIn PDF document text
    • http://synphabase.ch/upload/file/52437352795.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/54283355832.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/27949547458.pdfIn PDF document text
    • http://asvpp.fr/pdf/fawowazetuvotaseru.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/17290885405.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/boxebikafezabi.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/parifenuna.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/muxipasiroxudaxaboteko.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/riwinokitilokijewajiku.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/14721199327.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109101649394046.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/nogami.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613c859ecf4d6---92234391140.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/mugigogofupogebonekejo.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/fejizij.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/88757321096.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/73716498265.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/85401055446.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/96367097347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=avg+cleaner+pro+apk+2021PDF 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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 10624 bytes
SHA-256: 9e61242074d85fb5d548bda8947ba3c81ad9b65c8de69bb071068dc30e44309d
font_01_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 18684 bytes
SHA-256: 582db923eb38d16e893724ec5f7070c3d96e97a586e74f0d39556babe6d72b1e

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