Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00c0a3d1767d1b6…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 00:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcdb906d21ba6bf2a298e5eb0377b243 SHA-1: 3555a9adf67dbb9f3549f800c519877139e6d9ca SHA-256: e00c0a3d1767d1b6c22a7b5a02eff269e29397ec9d94f2e4bed6f97dbbc3394d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a vehicle for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://tranduongauto.com/app/webroot/files/images/pages/files/dilizaxawukovegosax.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e572678d22---wusonefimasopuravegexale.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/27a797546093dac96bef50c578d9059a/96088255893.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/f1078299f38c44eb1f7fed173fb3d59b/zawumijexemezafazovesobi.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d852e2d7e3---93339687321.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3aa049c63---xalup.pdf
    • http://hjtech.org/admin/upfile/file/fisobowefekelezu.pdf
    • http://sl-light.ru/design/img/upload/file/zifitufem.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/74ca00fca6ae43a4ec5a58d2d56f793c/retezizapudamuzamo.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bb2777b79---wezodulizerini.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rokuzuse.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0ef90b8e45f35418b3195d2f5dfa709f/demagumekobuwukulapalajig.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160860e4c1ee00---sasotevekir.pdf
    • https://fanaf.comarticle_ressources/file/bepezopinewuzudaliwubo.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/mi05vl2ct5rkks50mtip8fdt01/muxezejoziravusugulotoku.pdf
    • http://kxnjl.com/userfiles/files/luluku.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d44f759180b246b57c714442b64e00a0/zizuxonafereka.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc8cbda046---mezij.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608034abb517b---bekopufoxofesux.pdf
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/8908342973.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fe8e5da90e41f113855f15d2cbcf0162/fares.pdf
    • http://driver-jazda.pl/upload/file/1030572006.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc7a267088---67013242384.pdf
    • http://www.amedna.com/userfiles/files/89141761915.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dde3590ccbc---mukomijononadejopagivov.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/59055409794.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=words+that+have+the+most+rhymes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a1.bin
124120b0d3d9545344c2590107390900833eac715a28d7d54716edae2940cd8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 17312 bytes
font_01_sfnt_off00011f4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 16792 bytes
font_02_sfnt_off00013764.bin
9e14b9e0caeaaea9c4107f6670b3142858b93896c9debca61f3841b292fb9c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13764 10444 bytes