Malicious PDF — malware analysis report

Static analysis result for SHA-256 38852c36613d74c4…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 23:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f76c5fe7f2f3c28321204acc3bb64641 SHA-1: 2bf29744014f6474dbd8ae368ba6055b094d6a91 SHA-256: 38852c36613d74c42a24490a44aa4ff439e668f18a07d6ab96bf247d8662e6b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of external URIs and link farms suggests an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=medieval+house+design+minecraft PDF link annotation
    • https://actaviaserica.org/board/file/files/kemuxuwusojotiv.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/67450244391.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/mugidugitexijagogovotit.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/negunafazedi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/xevemazokenix.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/lexaru.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210916_225919.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/gexapetuvapelup.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/nugagitosegokubetirune.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/03aa31e8565540cc33fb7456e370193b/44487200639.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/de4c086fbe36ce99d98466b6be8972b3/13380967316.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/44713100913.pdfIn PDF document text
    • http://zgic.ru/!upload/files/pedoxewosew.pdfIn PDF document text
    • https://teamcode.net/upload/files/81547560526.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/77888689450.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bda9a353d---wofiriwemodevuzivib.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/89741775005.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o4vs6d0rr0isqj6i59eijkj6i7/lidovumedagoj.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/muromepopone.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/79439024242.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/zazijakomo.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_off0000abf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF0 15572 bytes
SHA-256: a8f9d288834461e4bea294d94983686190e3e4149fc1581b72dfa0a021b7dc18
font_01_sfnt_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 11084 bytes
SHA-256: f1455dbb3f7cff7ca918e68ff9ad0cb4928c8935e781f2354b65aab9eb89c522