Malicious PDF — malware analysis report

Static analysis result for SHA-256 7198d6343938a96f…

MALICIOUS

PDF

84.3 KB Created: 2021-07-10 10:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72e4d59fdd648631a0a2ca8fac016b5c SHA-1: 20431a5916fd561715fd4710fcb4d574af85194c SHA-256: 7198d6343938a96f746ad7c0d9eb520ae6cd4e07f4e33009d979bc768854860a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=instant+remedy+for+constipation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cbcc1ca7f---85952381208.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/16315236105.pdf
    • http://446888.top/userfiles/file/32258803112.pdf
    • https://kodcomputers.ro/2664/uploads/58477594698.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607992e7d1a17---53922701721.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608701b2b98d9---tagunisolotadubifarur.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a23562f25---8508297115.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074964b02890---62485404725.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0d4d35d0---34386225589.pdf
    • http://abpaluso.com/upload/file/sojubularuxigelobidujiwuf.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f794d93df3---77405831951.pdf
    • https://stopserv.ru/files/file/zuzugipika.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020e1586b7---rofiwurodupirowizom.pdf
    • http://sushiloverca.com/uploads/files/52191236551.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/68raues64lll5bqeg6vbl0no9s/lesafirarupesijonoluxolew.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587fe8f0c8---19598526291.pdf
    • http://pokemom2.com/uploads/files/fopuvupuzepadapotobumut.pdf
    • http://skybuildinfraprojects.com/uploads/61440772259.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c7335f540ca68e217c327b6dbb9ba16b/kasetelufawimizomivi.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/53187709008.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757928af477---visusimenutikuput.pdf
    • https://nikosdimos.gr/userfiles/file/napijigefuxutasifadu.pdf
    • https://eobliecky.sk/userfiles/file/rurixifenapifumawesu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e932.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 16792 bytes
font_01_sfnt_off00010149.bin
afb26c7e140b4d097c92b3a55ab149355dde34f1629d7527e6272cc08fe9a7f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 10800 bytes
font_02_sfnt_off00011a33.bin
95ae5aafc11653bbaa369d9d8ac593574e63aee955bbfedb5ab32d49fbd9bc39
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16180 bytes