Malicious PDF — malware analysis report

Static analysis result for SHA-256 200ca314de804912…

MALICIOUS

PDF

89.1 KB Created: 2021-09-05 02:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eefea8507b657b2d14f8f010bb4b024a SHA-1: 9f4d44737cb5699a14dec573ffdf1413c91764fa SHA-256: 200ca314de80491283f900a21799c359b717ad589baf3f30b2344dc4b4ef0bea
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document employs social engineering by presenting a fake download button and luring the user to install a browser extension or update. This is a common tactic to trick users into downloading further malware or divulging sensitive information. Multiple URLs hosted on compromised CMS platforms were extracted, suggesting a distribution network for this phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160810e2e11302---jaxazakomasewonobugomeg.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d177018cdf---88369644261.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0c93a508d9b1debfbf3965e102e60dc8/12452201147.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210505063046.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f5b655eb19d9504ae07a11ac075277a4/korevanufosakexot.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef11ded62---45864689870.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/juzemugatotojujadozowewu.pdfIn PDF document text
    • http://soon-xin.com/fckupload/file/9187810737.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/zilazojozadunuzid.pdfIn PDF document text
    • https://bursac.net/userfiles/file/53720440538.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/38332767889.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/pegufexad.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/82368326039.pdfIn PDF document text
    • http://airsoft1.ro/files/file/kilasodosu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/guzabog.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/69949208e30964ad15cacd7336255489/dokevox.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/tujuzapetima.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0oamhht81sv7ep74k4bal8odt7/bovibalatugebonu.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/24781299916.pdfIn PDF document text
    • http://trivio.it/userfiles/files/74842057278.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/8472e205fdcb70f73291e418cf405d36/pogosuzuvutarom.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/rajake.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/ebfa9c36fc7cc39e7198b0f31482bea6/jukolebi.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/posevojet.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5e878da68---15663514185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=java+notes+free+download+pdfPDF 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_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 18428 bytes
SHA-256: 4a8295869c20596e4c226060f9309e31567a6e672eb73178067d94b939f62273
font_02_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 10544 bytes
SHA-256: f57742bebc4f4e513fe1214dd759813475e18fb55fba24dfcd3689dc45a71b9b