Malicious PDF — malware analysis report

Static analysis result for SHA-256 340c5f2e2af543bc…

MALICIOUS

PDF

93.5 KB Created: 2021-09-08 11:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c55153cd4b70d14a05aad2322f2bade SHA-1: 318336e688aa224e7c21f94356201bbcb3704ec8 SHA-256: 340c5f2e2af543bce43436ce3acb366b766893e32b63fa1bee6053706e4c844d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://bloomx.com/sites/all/sites/bloomx.com/files/34012792195.pdf In PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/loputopirepupirazi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/sijizofedip.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e8770362---313579900.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/86634189517.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210601153507.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/gevazamabikojowazokowiv.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5ddfcd0304ab677245d1d082e1263f7b/sipadudelubikivu.pdfIn PDF document text
    • http://effektfilm.de/files/file/lepibuleraladematafibuxel.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe18d247fc---64781645244.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/aefe21222e626d182038a978e08a5a44/11726848149.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0facjdcb1620cl5f1t85e0osp6/297140473.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec2b471a9---rizes.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/646d1bb893c8d273015ce2424fb102aa/roxowineviwon.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/58129682670.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611106f512a9c---saxevutulavekibaxademew.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/57607798536.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/60835081344.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/50755696811.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ebda4ec87e4c2ee9d9db42f7465d6a04/kemuzabe.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/xufojafusoriz.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210707055325.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161336d5696d9e---supaburoxiwugevapo.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/17451954660.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f686c280---82573835524.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/48856259819.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/monejigajafu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160908138466bb---34644287910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manual+handling+regulations+2002PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 19748 bytes
SHA-256: 6d7cfd1cd2b5630b04ef856564b82725251acc7f948b415c8dd40a1ab18fd1c0
font_01_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 10864 bytes
SHA-256: eb7f4ad2bfe38738ffb470663c010cbc7738cca516ccc31e41f7e95052f3559f
font_02_sfnt_off00014fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1