Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be99ed4c934e14b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 05:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ae6b1549329e26278334fffdcc4a7f1 SHA-1: 8a9c840614d56325f99db2b29ad5afafb52ba70e SHA-256: 4be99ed4c934e14be73ff539a1de68d9032a4b3c906019f77ae73496a986a90b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The presence of ML and ClamAV detections further supports its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=instagram+like+hack+app+android PDF link annotation
    • http://alianzablue.com/aym_image/files/dizezujelodipawetofi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xaduli.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/77240764446.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/73636843101.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/46886435929.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/mofususapelagapowimak.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/luluziwur.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/wapivewabakade.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/32945890613.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0f9vu7fsokpht4qev9vbc2kesq/megoremasozuvilifomusam.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc8c5bc97---ruvototiludifi.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/buxopanubufo.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/zadakelijogimuwifadinelu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379116519cd---salipubuluriwirij.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130850a7c718---1178127304.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/jatel.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/rivofi.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/37844027785.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109161742401485.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/84628943102.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0t345o24re87f07lltthlhfil1/fizugivuboxewuruwakaw.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/5706993121.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/54986303021.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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 11004 bytes
SHA-256: f6f22d0b49ebaf0dee1be968522df3d3f504b625d6497d2d0b8ed43a4efdea2c
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 17416 bytes
SHA-256: ce4c31e5c12ffc365ca7aa22a197145538178297c1fe9dbf9e9bad423cf1daf5

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