Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef84d11d31f0127…

MALICIOUS

PDF

108.4 KB Created: 2021-07-21 10:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f72804c161bc3580829f730d7b768de6 SHA-1: 42436b12d9097984300d340cbadc279c882ae99e SHA-256: 0ef84d11d31f0127e232b0549310a1774ef26d51dfc20f2060c9a10758a61ed8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs are used to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d74a110c02251dca973c87cfc514bfeb/sabixobusir.pdf
    • http://scheidenschiedam.nl/uploads//file/lokovezonomaxire.pdf
    • https://nabijdefossa.nl/upload/files/jinopekufowakazi.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaa0ced33a---81375808770.pdf
    • http://angeladaniel.eu/uploads/files/34987593214.pdf
    • https://ayurmitra.com/files/file/99960533805.pdf
    • http://rjt1.org/upload/files/12814347064.pdf
    • http://eortak.com/img/fck_temp/file/pesiwitigawagiko.pdf
    • https://sasalidayanisma.org/uploads/file/60565595939.pdf
    • https://la-klamm.org/userfiles/file/10998777445.pdf
    • https://kermiradiatoriai.lt/images/files/refonuxobizinatogazewo.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcf2dd650---15830379508.pdf
    • http://renovfab-menuiserie.com/userfiles/file/pubetatenetepusikiso.pdf
    • http://dekoblickfang.de/userfiles/file/31095002321.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a848169c---51876856439.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/21885435310.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa666fb1933658f86bbd62b601877252/jepagorumadone.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/misagekijanebuzidufono.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82a6c37c7---11924165722.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd17d78b9e---kudebimuzezem.pdf
    • https://tmtteks.com/files/33705119890.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a24edfbdbbe---kikevebazibimusa.pdf
    • http://studiotravenzolo.it/userfiles/files/91568077944.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+lord+be+with+you+and+with+your+spirit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013607.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 16792 bytes
font_01_sfnt_off00014e19.bin
6deb27b329eaf8ab68994893d120cf703e3e9b5fe59bc96e39eb65c09e8b890a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E19 26216 bytes
font_02_sfnt_off00018b31.bin
512dc2db71809ff4d28f339bca7237be52d86c8833b83a1985ef0cf664f9791e
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B31 10892 bytes