Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e055a199cab1aec…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 14:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a85d1011c79fa91b8c29a9bf57813264 SHA-1: 02b04c1ce0a145a5256b9740d8f535c8936b58e4 SHA-256: 7e055a199cab1aec2cf84e9751d7e16a5da183ed047e2d2cd020d8394ffe0458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=kirchhoff%27s+rules+worksheet PDF link annotation
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/02e7c5bd95e777b67b63bf5dc49bdb3f/tamudazimu.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/pagewinizuvemolasisejud.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/jatixukoketudufulonak.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/qi646i22u4jh08p49fk8aahe8t/52168787487.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/44796515474.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/32124512652.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/jixuxixolokapigu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/85322942861.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/wedejoluwaneranewenowar.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/mupadirobuwi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb851cdc7e6---fasiluvuva.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfb48857d---87073133025.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/74390158542.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/89638813672.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d936dcc2ef6---7378903426.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bae16fd6f6e---98941897888.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b35a0101196---96433578658.pdfIn PDF document text
    • https://network-italia.it/file/84542169296.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/56a37303715ec98312a923260ca426e8/70849200766.pdfIn PDF document text
    • https://lapakunited.com/contents//files/8966836171.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/67071645194.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_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 10468 bytes
SHA-256: 55f510a94687bc03279413ee70b933cb2f488e8189ade1ac5ed75c4bcab62746
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 17684 bytes
SHA-256: 53dda6674b7daa7c3e40f251ad545096737735994715ef98d6c27af5445005d0
font_02_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1