Malicious PDF — malware analysis report

Static analysis result for SHA-256 e097106a8ab2d27b…

MALICIOUS

PDF

71.2 KB Created: 2021-08-28 04:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18e1fe55175dd1574d4b3790514af9d3 SHA-1: 901f2dfa421158360f4c2205922e057796c6d161 SHA-256: e097106a8ab2d27bdc69d1eed7b4b8fe1a63c9ec67fec7678144e5d989fcb818
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 links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of external URIs and the nature of the links indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0f503c5e1---xoputanuvujupunig.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1e3a594c---9338355068.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/welewopesiv.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/j0c119mjaqp1b68dp8kcrdma5n/58309398711.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kidilemimi.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/64351897552.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/losodasilewulejuwiluwa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073afa7b8285---86168254844.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50c1c5e9c---44814252619.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/janofomiroxofog.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/92397077533.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///fibogazuvolapukavefa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fab95a075---gexivopa.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/raboxawitixori.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/67509633522.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/8995305404.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee13be368dc---furufoxavowofa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dffdf258d9---lubuxumumujunojale.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0af1b4af---69902082720.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/xaduwidisor.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/50141158301.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/gifopesefitele.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/rebuzatedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=worksheet+on+ratio+and+proportion+for+class+7PDF 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_off0000b5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 15736 bytes
SHA-256: 22c51d5e866bd9722f7c79a8e4b3b8fcda27609adb92e51a82e01efd211aea76
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 10852 bytes
SHA-256: 2dc19462aa26dfc9a34c9657c369b5f9652b87edef40f7a40b9e6c20308fe6ef

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