Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da4fa2a1f38e133…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 21:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a2c45ba84a7886542f0a49238fd6d50c SHA-1: cc19a97acc97b2d208523839419c903214a6ee50 SHA-256: 9da4fa2a1f38e133b9fb137066d96fb1c7533bdbe3f4513ee1c7d2eeaa892a0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with multiple external URIs, some pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eldmsh1.ru/js/ckfinder/userfiles/files/60811353805.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161353ba1ce748---vopevinaxufonis.pdfIn PDF document text
    • http://abnicum.com/files/file/87928685706.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/xalutilobad.pdfIn PDF document text
    • https://t2sc.me/userfiles/nopenurusozinaxiz.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/caabf43ca55dcdf1d5ac397fb5b44cf7/6283854544.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/93391383204.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/20224012350.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/92677732122.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/rukidir.pdfIn PDF document text
    • https://digireg.nu/upload/buvudo.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/57635445843.pdfIn PDF document text
    • https://norservis.info/files/files/97478041379.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lisewijuwidotizari.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/64092838724.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/83542285425.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/12132253766.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/49151327451.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/b3fc6813e689dd6c94b40a6d914a3eb4/61892336502.pdfIn PDF document text
    • https://priscar.com/documents/files/54657237207.pdfIn PDF document text
    • http://cycling-software.com/files/file/betubawipu.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/39495392400.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/71269964404.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/betedafura.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/duteladu.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59299012049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sop+triase+igd+puskesmas+pdfPDF 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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 17628 bytes
SHA-256: 3c536d3a5e6c310b5498dfa8897c016caf8654e932ea7db195716bbb730a411e
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 10956 bytes
SHA-256: bfdb5c768ce3f03b498384432e4953731eb59f0b7b701d07e9ecd99f1ab15cb1
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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