Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ba8614240df986…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 19:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7ed3cacbdffc257b6b5b6f5676120506 SHA-1: 20f181334f79a9125a9d27ce7b0721f8489b85bd SHA-256: 54ba8614240df9860d264a6e41ff6adcb19569a2c6360f6bb3b9a947a1deba77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The primary purpose appears to be directing users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://inwebjor.ru/uplcv?utm_term=unkilled+unlimited+money+and+gold+apk+download PDF link annotation
    • https://rh4-h1tapi-turbo.com/contents/files/jopibuzewetaxagoperipe.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138eadfdefcd---93169621276.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146f13192ab8---49950167695.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/vokejamepin.pdfIn PDF document text
    • http://linza-market.ru/upload/files/wigolokilaz.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfe29fcad---wilatibizo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vaaj87gfu6ilet4n2kglmotgf3/palalatonafobozikobujo.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/juroparufodilikik.pdfIn PDF document text
    • https://mimpishio.com/contents/files/xivogupifij.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/doluberewadub.pdfIn PDF document text
    • http://wdnederland.nl/file/26231025610.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/91318532416.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kazujisonivo.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/13766207825.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/lipawizodosota.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/mamuvazulegaligugaradise.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/fasajur.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/binip.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/nibevazepisesevelutirugo.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/jaxinotigaxamubapikigodun.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/56870346935.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366fc2dc6bb---18850962840.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/dazugemusupamonulovuvijis.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijemadakejezofano.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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 20520 bytes
SHA-256: f11cdf1543be257f45dffcc6e4a37276aade9c424d1a4d6e2aad2948dc11fd4f
font_01_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10868 bytes
SHA-256: 6395bbc112db23c1f0f9919080bb359067b297b49f2e82a58991c80f9a7b8440
font_02_sfnt_off00012ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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