Malicious PDF — malware analysis report

Static analysis result for SHA-256 7036b7b3760c9100…

MALICIOUS

PDF

81.2 KB Created: 2021-08-03 19:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3be608ef035dea6dc2eca06dc05fa255 SHA-1: bf8a9c1056de8e877f825ac0a39bc790c6308958 SHA-256: 7036b7b3760c910093679779b88f0eafa32c321c6f7b700031265b5add199011
156 Risk Score

Malware Insights

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

The file was detected as malicious by a ML classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous external URLs, many hosted on compromised or disposable domains. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://vdi.vn/userfiles/file/48710161372.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc72b8ab13---25902138716.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dslbnl96l8jdvod5pg0d1bm3dq/jokudeto.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/2479994913.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6263d80287333188b1a0d18eabaeb65a/lanesanuriz.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560438476f---77717337987.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f28b1ad64910f4b7df5d85215ac8c058/relapofufipetibiwexire.pdfIn PDF document text
    • https://chptravel.ir/data/file/lijor.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/kamus.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6k5griil11371iufn6kgn43hsr/fipobabexixopulegudujugo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c687bd80d2---gubiki.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/potevolarodilonexudegiwo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b44a4545a---88736275159.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/77664537431.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/57154283055.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/patstevj53r22hdmv24pteote3/tulegala.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b75ed677c665daf2d68d3ac7995debf9/borogudodokef.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/5380c930f343ae7d64dd9cbd10504bd8/36211013746.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/40612307036.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ro2mg48a43uf4ekrfnuubhiims/20058702308.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6cd1543bf---30864863134.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/lemagilewolasezif.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/94481089165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=minna+no+nihongo+n4+vocabulary+list+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 11260 bytes
SHA-256: d95c4182dd2f91514c0c446705dfd40ee3e3c9c6ab48dc0dbb1089d9d89bd182
font_02_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 17776 bytes
SHA-256: 2064d45e6d4d016863c3b06b0d28bd5569258f0c0de671eef292f0c05122c58c
font_03_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 4656 bytes
SHA-256: 4c7c8ec06babc35059e310ed40f11fd03d2db81817202850338a15d79afc6ae6

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