Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50e958f496df315…

MALICIOUS

PDF

77.4 KB Created: 2021-07-31 23:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18ed12d4c39de1e22c80b079f8c5f6fb SHA-1: 432576d37298a34603b39196da09f80922fc0f9a SHA-256: e50e958f496df315d957fbee32d3ea84992eb2a35ab7c61e1d69cb108fb550f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40dd53f1c---bafoboxekitogi.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/sekuzoviwavagofapevonegi.pdf
    • http://globeksa.com/ckfinder/userfiles/files/feloxogisujojazogakuliso.pdf
    • http://adamlegal.com/userfiles/file/defigotobagatufodu.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/sapabolekogogokozanuzo.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/lv0rbceu96628sig7ad1ut3qou/zelili.pdf
    • http://footstepfloor.com/upfiles/files/59947347215.pdf
    • https://atlanticcompact.org/userfiles/files/buwisexopomawevap.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971a3fd12f9---zunakujokiziberofurikako.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j22pianvnraff2ue9556h3t66u/rilenufupufesogonimikaj.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/dusijuwazudubujukukazokon.pdf
    • https://readandenjoy.ae/userfiles/files/wazorolaxaginipelizoso.pdf
    • http://domusanna.it/userfiles/files/lapevori.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/mitvusb5s3vmtqcr62eed4lp47/nivetogavop.pdf
    • https://medtek.vn/storage/file/mobosalikuwasusawotu.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3pt722kds2bsm2teno4hj4c1u5/gokobawiputuzikesisem.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-25/20210525071735244208.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c42d4442---nodexiwadetek.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/h8su49j5di71g23eflv6kqei82/18306224047.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/34mlsn5p47h6ftkrpht3i8pmo4/37652916683.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe13096ed1---jijujidubetegogajud.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e6cdb3d1---87940821044.pdf
    • http://ehs1958.org/clients/73155/File/wobimofajazowezinigubu.pdf
    • http://greenplanetnepal.com/userfiles/file/fapepaxidatelikow.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b1533784---17722120174.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=makkar+ielts+cue+cards+2019+pdf+free+download
    • 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_off0000c6cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 16792 bytes
font_01_sfnt_off0000dede.bin
af9edbb02e7e171d8ee3918ca91a6fd1c19ea1e20270c58d2584ba3d3cb72b31
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 17168 bytes
font_02_sfnt_off00010af4.bin
ad572524fc43b912cf74a368b39a71132ba3694367b41cc7e92baf99d8eb7ee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 11344 bytes