Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a57e492e750f39…

MALICIOUS

PDF

69.6 KB Created: 2021-09-22 22:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73571fa735da291158c05bc71ca0f44e SHA-1: 067af9b24cdb385c47b5807c90c4b1da4ef68430 SHA-256: c8a57e492e750f39fc3dac49d5b13e21310555191a4822d467ca8a6e15541a06
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting a tactic to obscure the true destination or leverage compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=tubidy+player+free+mp3+player PDF link annotation
    • http://kronospan-mofa.hu/editor_up/15141780518.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210919_D141B1F6BDCCCD5B.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/47193030689.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/xazoluzuk.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/96602569235.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/nidevamosoguvagewupijuluf.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2d185ed387f160e59f2d06a9bd50311c/86014079488.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/76814656473.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0abd83f3---27364494465.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/93487650534.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/zawugazawokodobokawivalug.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/notesunisuwitakizatagef.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/5139207748.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/487081827.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dumilukev.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/wemebemifawofaronaramisa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e907194331a45730c3ade2a8f14eb94b/belimijazolatib.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/dixoziruzariru.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/16638515983.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/tudenopepilodubun.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/gaxomifoxu.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_off0000b091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB091 15860 bytes
SHA-256: 158c5a2ab9a7f1a63cb5b549856358cb121a8c633d46ee8afbfd141d267aeaf5
font_01_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10660 bytes
SHA-256: 5587ab57088ce8208ba78360effe3ddae8dfac53d711214706821fdb714d3149
font_02_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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