Malicious PDF — malware analysis report

Static analysis result for SHA-256 655a1e45a7ee2850…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 07:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0dccffc36b6c5dff0edf13da68d85345 SHA-1: 2af89c014d33baf1bdc23923c5a6098279ae72bc SHA-256: 655a1e45a7ee28502c84e65dcdeb1e10d3e10fb29788d23da73504bccc8efd16
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to websites hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t1ffldjvbha8e71uqm2inrlc04/11480877724.pdf In PDF document text
    • http://chickenwild.com/upload/contents/images/images/fopexelifuvejukawuwot.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/nakexevewuviv.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/88068591105.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/jopisulovanek.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/4614087351.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2d8db536f4d259ea29185962a480c9d0/60788186263.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/kapebomupib.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e80c6e71---vijepesefazodizazibube.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/00920d93e61deb49cf2a1425e4f7f3d4/78761630553.pdfIn PDF document text
    • http://techbis.pl/files/file/buwixofopevonufuguje.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8384564c1446afdc4e5febcc4735435a/63705745009.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210623135826.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ask8nh6vccedpp2lj1ddh45ke0/88049575180.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b89145a8---mesajamazakerulinirawuwav.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/kokumutixanufibevofetivep.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/bifijozalusenis.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/18ac40ac59caac1d9166050820814303/nanotugozezalolubem.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ni70gmkq1m6gc6bi9uq1gvft27/14972346081.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/gumobejupevutokonemugodu.pdfIn PDF document text
    • http://home-plast.ru/foto/files/25209621798.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1e9d61cd---malofoxizudow.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/43274114708.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/44441581980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sonics+nutrition+guidePDF link annotation
    • 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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 16972 bytes
SHA-256: 85b09f5cb33ab659d9cd46b2ba5652254d604e1981b38d14018d14f32876e7df
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 10512 bytes
SHA-256: 3d8ae54a38141927b77e24238fe4a7c564bc1d81b881b6727959b543aaf5af86