Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e3c0b5a3ef68b5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 05:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a00b3f06cdc061ab4f951d03e4e56e98 SHA-1: 0e6b82bdaf436e26a9703968c06b256d35241b6b SHA-256: a3e3c0b5a3ef68b5851d3430fc5f85c0a134924914c237a33d59553b3fa3e17a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to distribute malicious content or phish users. The presence of multiple external URIs and a link farm structure strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=code+for+calculator+in+android+studio PDF link annotation
    • https://rtquery.reitoken.org/Coaching123/images/files/40240130535.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/35057866625.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/61559811477.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/jezowexigosufu.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/femufewugoxogonu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v04s0p7cp0evt1nhpefec75aq6/29088671287.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/keranamomusaw.pdfIn PDF document text
    • https://sambelteri.com/contents/files/50237416783.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109082348106715.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210911_41BD2D33F1AC182D.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/44941703697.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/31341379895.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xebekusuwibopufiwim.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/73977233811.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/23224474588.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/soruvas.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/7918005621.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/141033456075.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327f09462f1---43613403402.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/96169254107.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7999dde3d9a3a82d1ab682812eadc7f4/nabinezewe.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/20964796211.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/64121531597.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/52420536606.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/nibedufitutofe.pdfIn PDF document text
    • http://yepuco.com/uploads/files/95882442022.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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 10600 bytes
SHA-256: cf388e3090814150e74d5d162c50acca1666091d3e834cc85ecc6da4a2cb6e33
font_02_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 18856 bytes
SHA-256: be62b666482022642c3a028144a7b4f439c46a49bf46d9b6fa1485453cd2201f

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