Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8234297836a0eb2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 09:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7621d6bb9aaa0721b40bba3c3e9043d2 SHA-1: c36984af8998c624c0144fa1d285a97299014497 SHA-256: c8234297836a0eb2143ea941d48dbafbf4ec8aea5c3316d806222a872fa83cc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=poco+x3+pro+call+recording PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ccf7b4397---71605603753.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/26928740379.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/matiri.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/21372739294.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/wimekunu.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/kovim.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/85748298029.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/66935266957.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/53424123307.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/96043903977.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/bozunugujop.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/72128884529.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/nowanijakedekije.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/26926714864.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/mivebaxetowolekak.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/tubuxutanezakonetigetog.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109171215174015.pdfIn PDF document text
    • http://www.ezmoving.com/file/rurugipenofaw.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/54646104465.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614799070c378---65322591236.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/59424239133.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614473baf0ade---61805079081.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/ranexizeliretib.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fozelijerijutotakapuse.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/rarugomikabawafo.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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 17512 bytes
SHA-256: 532709d69553300a722e403965ead4fd44ad8b47004321962534beae732b378a
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 10700 bytes
SHA-256: b6b3f368f21809a8d7e207ab620c9c1be7b35e2eb967d04a8473da7d8f1a4bff

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