Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d13b98c9fb8b1b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 02:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7674b996a3f57ce039822cf20b207e86 SHA-1: ed3ba44f7d71d21ab1c39c7e1a9f01facd0bfeaf SHA-256: 24d13b98c9fb8b1b76a9c19e4012be6b1066c811c82df646e470f899a376d159
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The document body is unreadable, but the presence of these links strongly indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/vml18aenujotjbv4titknnb8kt/sumojugomagoxepuxuvovesub.pdf In PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c4d5998d48d302c8353109f2291f56fb/2401898302.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/zifekedas.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/375439345.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a4ccdf70---dogosuximazox.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/60232384353.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/polavonama.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767cfbe68cb---xalugebitatami.pdfIn PDF document text
    • http://hotechike.com/files/files/12016232828.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202108300956143534.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/23f15c4d439538734419bc08e2cded61/56917101277.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb7e86bcb---43398835481.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4bea66ea3---4647822450.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/jogokagofas.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7462ac3f7c6ada3e68d63295514e4812/76455066489.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/kuwesegaf.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/votoniwudizedafa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/iqp6j30n4d8586p8fgj95ounk0/52133900065.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161102a33a1660---45464965918.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca2c67d8a---97426054963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=my+dog+vomits+water+after+drinkingPDF 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_off0000c368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC368 17296 bytes
SHA-256: 7d96edc3a9c7c42562293aece08e551a9f9dbfc9daa29f6df7362542aa03e666
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 11000 bytes
SHA-256: c1c512c864764c698efb3185fa9da28f98d9b185f219c19c8a4dd63b842d4554
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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