Malicious PDF — malware analysis report

Static analysis result for SHA-256 9219825f7154a7e3…

MALICIOUS

PDF

97.4 KB Created: 2021-09-02 00:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bee8113c1b587e79a4b20ae5ea9e07cc SHA-1: 81710368443267656a3cccaa5181f84074cd3a2d SHA-256: 9219825f7154a7e377f72fb674f9265de56faebaba4ea40223027f7142becd1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request designed to trick the user. While no scripts were explicitly extracted, the presence of external links and the ML classification strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smidgel.ru/uplcv?utm_term=computer+science+2nd+puc+lab+manual PDF link annotation
    • http://opusincertum.it/userfiles/files/pamuzuzuxegalifabasexoka.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/diwot.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/nigoxa.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/lezekereliledujejuriwed.pdfIn PDF document text
    • http://change4best.ru/upload/file/vupitoseranatawi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16127b3f2dec6e---59618605957.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612da717bb88b---gufifexexapixos.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/95958465569.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb79cbde748---wiferubuzofikove.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021081607304029.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/68504241692.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/roroxiwagibagomu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758666ebaa3---12620945327.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/2143438689.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8b815240f---buwimoravovitosutim.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/lomojefotuvam.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/55487392954.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160941ac3984e9---bekawurivezoto.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/105aeab949a2ff06575d738046fe19c4/wevoberan.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7a25d39e7e80e11909a4b6f8f20c45ca/509166469.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/39742628773.pdfIn PDF document text
    • http://deforma.it/userfiles/files/60583479175.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/duwavurezaxetebijitabu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210805205135.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95f873f240---xotinuroxubaz.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_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 21816 bytes
SHA-256: 1b37889a6c09a1232a9ff8117a9ce1936ea7b9b43fb60532558b1f73ae1d2e06
font_01_sfnt_off000144bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD6 11064 bytes
SHA-256: 9149c5429fb5d3087328198a49609fa753edf8967bb611592995efc31a955a49

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