Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ed79efa237fab5…

MALICIOUS

PDF

77.2 KB Created: 2021-07-15 10:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 23ed183d2f19c6e60bffba659e8c4ab4 SHA-1: 7e37a0b023ecb49a11d5745ec19eb7e03b83a0fc SHA-256: 14ed79efa237fab59c3ecac05948a5ce6ef7b3ab971bf8f72a8717333acc1083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lure users into phishing scams or download further malware. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=contraction+in+a+sentence PDF link annotation
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/c10f7994a9932918ac48dfc81b956af8/18038652758.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1623663786.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/37787738906.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/newevinobawodaxujilu.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/lexiwapejirumuf.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/76870723890.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/41372254841.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/eaaad1f8cb00494e34fc02b99f3448bb/56706234544.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/gejudumakofowerimuron.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q562b8jv6fhmjhhm496qt64op8/lemesurati.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vewujunup.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607591f703167---22084801255.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1cc613d5551387bf1e3df6a51023ab52/74403497502.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a1c9a8985---zowatitajetujovosisixu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84cddb872---zaginozupa.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780e2272a29---zolekevosariva.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90622e4a8---fefizatuluzodizoganeme.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/34838326542.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/86498889495.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/38680296020.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/26019179335.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bf829c7e---ferifofanuvosafip.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a638fbe43a---xexap.pdfIn PDF document text
    • 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_off0000cab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 10208 bytes
SHA-256: f1a222319a74577a701b1213946eb09a65b4e6659b7f8a5c0b7226e3c2f299f2
font_01_sfnt_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 17432 bytes
SHA-256: 8169cee212fff562d27f1c9b88fead8fd46f99fa9eebc166077dcde25bda3ef5
font_02_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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