Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d96fbcfbbc38bf…

MALICIOUS

PDF

85.6 KB Created: 2021-07-03 05:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c3ca8efb987d38c194b61ac39d51607d SHA-1: 809ae6b6376c7c2d34daff66f773c8953d1b7353 SHA-256: 59d96fbcfbbc38bf14703a87d47dd96375f11d4aafe8a795f4ada2246a6fed8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting sites, forming a link farm. These links are likely used to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=cool+thumbs+up PDF link annotation
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/10052972227.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/wonumunevodisasodiwuv.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0oe3mucg3if68hco7etq1t7581/zogoviwuboneza.pdfIn PDF document text
    • http://safarang.com/basefile/files/padatuwejirusegim.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/24532316021.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/61454395340.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873ff2c6d9a---kivovedunowub.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608011e304109---44486382688.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062302184370554.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d34b5ea6152---korelibuzebaviwepogo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c3afe637bcadbb78d68ce4d9f8b563ea/82672636918.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/30271375605.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915f4d21d39---45552415615.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/wenanelajorimamanudazuzel.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086004566772---kamojipasumotabozof.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/69432661277.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/xejunenonidadapef.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b9a9874b7---50542344768.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/31055331780.pdfIn PDF document text
    • http://allycatering.com/userfiles/wopasolerubixodenes.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecbe309487---jineg.pdfIn PDF document text
    • https://aristonails.com/articles_files/files/danarujazebeluwa.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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 17532 bytes
SHA-256: 88cb5944e66a0fd03377b453b8f421ba98a937e48a19bb745daf451a42530979
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 10200 bytes
SHA-256: 84461b049ca7b627c3fb8abd678564ba8c8c5825962aa502d622301012fa3ff2

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