Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55182386b2fe377…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 20:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe17fbcebb8b22f9c8c15aa94a8f4c65 SHA-1: eaf5f4ed659ebdb06f0f61b2a1f54fe36e405a88 SHA-256: a55182386b2fe3776cd465ca8c29c7847f26ffe29ac235f21586d72631f64a85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to lure users into clicking malicious links, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://abss.pt/userfiles/file/83168105908.pdf In PDF document text
    • https://ms02bet.net/contents/files/14675177053.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/55967152289.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/96619853749.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161257badd1a7e---fomosiz.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/42221679340.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/mobakit.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/bibidakefewofoguru.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a225ad7cda5---borom.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/b1d38jgl3i8ck677hqq99v35qv/kipulepegazatexe.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/fizokuliliref.pdfIn PDF document text
    • http://whatdwellswithin.com/file/mezuzamuxojejulopud.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495be414d5---zonunavipaderuf.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc65be744---puvobikinupineti.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/pipaget.pdfIn PDF document text
    • http://getdol.com/page_data/file/ditekopuvoxaropakubow.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3c02f49f6da3d75f0faed11e475d96dd/moriwogijiguvabanufipug.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c1778c9f5634ed9a0c21efaf9376b860/totitodesupowav.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210529_16A83C1A7F42A1A7.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc09b7323---32971130082.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/belavesavuz.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/39659953669.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/99816556cdb62ad510ae7851411a1934/falokiwadugakosuzisade.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160708ced4f792---52548890484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+to+excel+converter+offline+software+free+downloadPDF 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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 17184 bytes
SHA-256: bbd5726558f164292cb2d5b25488f3c977e5a656592482474f86d111a57db8d2
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 10724 bytes
SHA-256: 10fe252e5c5a05e4793c14cced66427a029a383b87f0f29791c7688d710ed4ca

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