Malicious PDF — malware analysis report

Static analysis result for SHA-256 745b57ef5b5b0ad0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 00:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 740100e886e4ef2f928925e6002f5279 SHA-1: 8c87eb828a4b5e6f59f8960ee1d20a6b76b7646d SHA-256: 745b57ef5b5b0ad041392d557162f40862f6e82aca0af39a6205e407e4787923
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a browser extension installation lure. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading and executing further malicious content, likely through a compromised website or a direct download disguised as an update. The presence of multiple PDF files hosted on compromised CMS upload directories further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132daad5b50f---xovisazudij.pdf In PDF document text
    • https://coop-alternatives.fr/images/images/13264392402.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/sabozob.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/ruxemag.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/wekopenaxirevifu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/64476288899.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/senejax.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/mutepanuvaj.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/sadosurozoluxuzub.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/25488919485.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a266635b---22010500178.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/51043885694.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zitegotulivavilugeb.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotuvu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/lodowafetubasaxipijosu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f256504c---80839050039.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vumulewakobet.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/27376877441.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/felatekedoxisowajele.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/32253342414.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/34850156695.pdfIn PDF document text
    • https://proxus.nl/file/40629034609.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/disek.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/30910152657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=seo+surfer+chrome+extensionPDF 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_off0000c970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 10672 bytes
SHA-256: 7e3395bd69c55d8b5bfc07dc88f530e1e3b55fcb942f7b2d0499f2f8285eb96a
font_01_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 17660 bytes
SHA-256: 765834df1a107a2983f4fb04d543b4254451e8248d1a05a30c3e089f78b53fe4

Open this report in the interactive analyzer, or submit your own file for analysis.