Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d65477740ac192…

MALICIOUS

PDF

491.2 KB Created: 2021-08-19 10:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d917dcc527f01fd00a1822721b1bf6db SHA-1: d5615bfc96454081196c4690b5c2fa0c5364ca10 SHA-256: 40d65477740ac19220c0f14432b3931367e71d8f549e5595f00c95b7efc9bad2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The embedded URLs likely serve as lures to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7410

Heuristics 5

  • 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 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.
  • 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://laborke.ru/uplcv?utm_term=libro+meditaciones+diarias+neur%C3%B3ticos+an%C3%B3nimos+pdf PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/164b5524a9ba3d0e9c39874903ba4ba1/konesivagusewavapapebiw.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/77f5e24947dd2bf9062abdf1b7c89ea3/54309246347.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/buvuzajewabibavumopi.pdfIn PDF document text
    • http://aa-nusd.jp/rejegetidibivosupef.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/vomiwogenadojub.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160969e19ed30a---wimevibe.pdfIn PDF document text
    • https://wagaskar.com/media/97320474732.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/71254354941.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608a839a7ed55---rubasijazukuluvo.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/13613313782.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/81998221756.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210812_AB85C026AAEE8963.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/tosojujosufedeniwedibopi.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nawukidurajogelegikexemat.pdfIn PDF document text
    • http://learningkey.org/userfiles/widesoduxelilapibigiwik.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/han32ootsk92t88kp6ngebj0j1/52200262494.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/70764603666.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7a686511---rorobagozes.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/14834410947.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cfda71a10d02d2f856638b1e9626bb90/29532981102.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/89617865348.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ooblce19kmuhv3ql00j6o8pkv7/88188091331.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mabutoborimirefom.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090c85b3d7f3---48403709238.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/wikiwefoxesasumifibevul.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_off00073480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73480 20012 bytes
SHA-256: 0ae3d3e35ae711c72c5988442472ef9164798b3d5eac0b3a452bfe0b34b85eb6
font_01_sfnt_off000767df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00077ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77FF6 11068 bytes
SHA-256: ac975fa0d10deeccef4a803600a6914ac18eb2d371dc7a28e989e9ea72fed960