Malicious PDF — malware analysis report

Static analysis result for SHA-256 f986f8a69438dcc3…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 23:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3af4065d9dd5ef68128bf3f8d1f3754b SHA-1: 8701338978b330b3184d2b011c23f88fc61cf571 SHA-256: f986f8a69438dcc3f31ec88cfeafc3add42727a39a91337a51f75212ab80bf47
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it contains a link farm pointing to compromised WordPress sites and other disposable hosting, likely serving as a lure for credential harvesting or to distribute further payloads. The presence of MFA/one-time-code harvesting lures strongly suggests a phishing attack designed to steal session tokens or bypass multi-factor authentication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://philabc.ru/uplcv?utm_term=android+development+demo PDF link annotation
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/83225116138.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/9906035355.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/nogikerajaxawiwa.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4785c2b0df831d9d4d2fb49118732e74/puzamalenosegurobeko.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/84683799793.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/46978605161.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/15829202442.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cc9792d4d8761c61a91d97fda0c30934/wefujobesom.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/zarexi.pdfIn PDF document text
    • https://ccskin.com/geektic/files/lesalerimati.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b4c750f6614fb0087a504226b01dec95/36495282201.pdfIn PDF document text
    • http://cardion.dk/gfx/fckimages/file/komoxaliwebemolixaxubeko.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/94538052780.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/45548969960.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/16899b866da8bff9bb0c3090ded972ff/gowimopifafazadok.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/18698463123.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/6857093208.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/mowarexefizujodadowo.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/86857276821.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/74125893891.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/22775076616.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/73480952099.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5e2b3b04---41802312019.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/tezupot.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/diwapeg.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/37777001229.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_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 17676 bytes
SHA-256: eadb911556ead759d1d03de69f7697ec1a3dbcecb00105c38835d456c5cfcc0d
font_02_sfnt_off000137fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FD 10272 bytes
SHA-256: 37a5ddf28563f37de0f48fe2fe8f23ef5b1f0897ca6c91cec58d599c5c21f1f5

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