Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce1beb62b74161d…

MALICIOUS

PDF

126.0 KB Created: 2021-09-04 12:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 90c60b10c55d86fd15e94bdb527a1923 SHA-1: bc3c695cf93fded228917e7e094091b4ed0d7f79 SHA-256: 3ce1beb62b74161ddf6a34b1ee6b9b2f50dc4488d1c1917a79d8fae7e5c785d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://www.accl-calibration.com/login/ckfinder/userfiles/files/8125656573.pdf In PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/danipisugogunemutamasusug.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/tonepufikozapakezavudumiv.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d72f6919d075c46f325eea95a91555a/85955419570.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/safopebodide.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce035a8f9---21523792564.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/49703377746.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/32343841471.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jtehsfcbkf4heabnpgjvsd5dg2/90094557414.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b8bc415bf---65756475207.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/jugamokesi.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/vovuzosuv.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210818_DF33495477AC4222.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/kupesotagiwu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/zafezu.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/pugujuxavosoluwezesibuduj.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089419663303---64525345872.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2e549308---41092580884.pdfIn PDF document text
    • http://chinazzjx.com/d/files/mubetapoboxanur.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/xajinubufomi.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/bafubixopaguxizizelovibup.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ba510ca0448be2f06ffde581db138937/58492558486.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b8b8b8f5---jowefefixig.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/5307090741.pdfIn PDF document text
    • http://mcutech.net/files/feruza.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608381f00fb20---259982313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=davis+drug+guide+pdf+aspirinPDF 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_off00018c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C52 10576 bytes
SHA-256: 0d8c1f972279c01385e841a8c2d3eb0baee0bfcb088f47b19c3dd94d01ce9974
font_01_sfnt_off0001a463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A463 17420 bytes
SHA-256: d5926e4bb4ea2e21c9f634445d7db9f4cf6dd7e1352010d8f3f623e2af34ce3e
font_02_sfnt_off0001d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1