Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad3c5b2891457a3…

MALICIOUS

PDF

83.4 KB Created: 2021-08-02 10:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e16d28fbada07e7c3847f95851c42083 SHA-1: 299d02ff89451d87481447e68d7846f0d3293565 SHA-256: cad3c5b2891457a3b4e539cb72cf65ede5ccdc01665c5341a33f3df16dcebc5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=pro1+thermostat+t701+manual PDF link annotation
    • https://alrashed-alsaleh.com/userfiles/files/9241649669.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2978cf81c---56093767881.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/migepaxamin.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/6623538900.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/zevaduxor.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/potosotisad.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/26416081383.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/vuwidavuvoxalilekifotow.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d2e71f76f04e4bf621c7e65851563934/46900218210.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaac33915a---30127548306.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tm2077rs2p8t23sqh8p5jmviu2/3841681696.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9172d457---dajukin.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609298e5d4dbe---wiwodufawotovoxevirozij.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f386fea8---tezasejimodip.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/63199568603.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cda5eb11ccf1b7580c2e53cec08a461d/94537237253.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/jojaborugurotoza.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20f6420fb---pisiwa.pdfIn PDF document text
    • http://landia-print.com/pdir/file/torokezuwibuda.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/3345816043.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/77485316969.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/25195546474.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/61036841058.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/vokavorezetikonama.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/732005220.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/54316942053.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/tokaluborofuno.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/23469565707.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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 10604 bytes
SHA-256: 70ea9865795cdda51725120c5cbe511aa103dc9c7d09a32cfe825ff7d6062f14
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 17496 bytes
SHA-256: f11f4738537471074b7303acb2d7fd2a74c0f95ed4e00f18f0413d28c499602a