Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4e2675e5a4c708…

MALICIOUS

PDF

67.1 KB Created: 2021-09-28 21:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2090f2f12f4e5468e78f5fcacd0f2e0e SHA-1: 944400a78fdc0360cb2cc40b28ab09450472b6c4 SHA-256: 7b4e2675e5a4c708ef5b32576e9bdd6fc182dd5306eed08dc58c674a72bef701
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to domains flagged as compromised or potentially disposable. The ClamAV detection and heuristic firings indicate a phishing or malware distribution intent. The file's structure suggests it's designed to lure users into clicking these links, which likely lead to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.2346

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mazraeir.com/images/upload/files/89968718041.pdf In PDF document text
    • https://investkwik.com/userfiles/file/bonuw.pdfIn PDF document text
    • http://dkind.net/userData/board/file/zujiwi.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/46291029252.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/rogaladexiberuwod.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8c3cfaf2771364ff04af1626c5939ed/wizarolejupa.pdfIn PDF document text
    • http://orenprom.com/img/account/file/53869982648.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091704083973499.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/26915895084.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/8484225976.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/fulepitigifanaxaj.pdfIn PDF document text
    • https://geloracinta.com/contents/files/81675581381.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-12/20210912222632957586.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136936c63334---1376719273.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/31121410064.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/logututi.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/dagojonowiras.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/19082388638.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/siturafafuxil.pdfIn PDF document text
    • http://hibertek.com/image/files/20210901_214653.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/41618332631.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138553e15d38---82862180001.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/67970339012.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4eacdc48ce584802533b6696f2c378c5/ximaxexi.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210912_030647.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/vateruzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+rid+of+black+and+white+screen+on+androidPDF link annotation
    • 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 15804 bytes
SHA-256: 447520383ea5b1dfefa6eb2ddafff63328aa05ef05cc4686ca0371487f13fe67
font_01_sfnt_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 11064 bytes
SHA-256: 1ef8efdea33afed9544ab5bf7b757240dbb9a3962632430ef5b77494e0e5c9a5
font_02_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1