Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c7f0eaf0ef2273…

MALICIOUS

PDF

95.3 KB Created: 2021-07-01 18:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8c08e8a2effad6353e46a7cd8366d92e SHA-1: c9d4d29dfcd057127e7ba452c493fc9bf74061d5 SHA-256: 05c7f0eaf0ef2273ee12f677cc82b7be14e6e717453059f053ca6e649bc6bb83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to lead users to malicious content, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j8421p9rqr1jgq0dv24go42eth/54239213259.pdf In PDF document text
    • http://schokobrunnen.com/idata/romufetoziluzanut.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/bubodebava.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/91936510192.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dqk3jf45c2m48gs5dlli5obgg3/428557525.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07485bdfd---dalukagasikefigegar.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ukhbtb4qeia551jvvpbl90q38n/42058419827.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/21284769509.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b01193875484a321fc1043a276569018/91958368716.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/benisosesagenogiduworimop.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fa56aee75---bikiwarabi.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/77765666526.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/37533307770.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db79c1de2---16475857725.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/10138661787.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bf9ec199f7b2e821f9d87e6c1bacc0b4/xatanenewapoximad.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/9633306729.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tl4vnjvr1khdo219s4cr1ndua8/pasesexelal.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/43915861906.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160afe17daa456---vufakizolovefaxa.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/lediropazezezobulamopove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=air+has+a+dielectric+constant+ofPDF 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_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 10556 bytes
SHA-256: 95590bb251d9d0eb3ec5e170554d72b64f209efc9b85a7c67a44998f8960b3a9
font_02_sfnt_off00013f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0D 18488 bytes
SHA-256: ea34b155021e703b8f5934abb70cf863864335f43310c4f2252743cd6faa2f7a

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