Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a139d7f60828952…

MALICIOUS

PDF

91.0 KB Created: 2021-07-06 23:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb8f4493f5a6102dab8502ede59c5636 SHA-1: 927aa4b97feca3f43f46a24091c50a86ca3e9476 SHA-256: 1a139d7f60828952d72d47e36add560281a8b5cfb3aae57a61f06abb4275c311
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89d281ffd---lupowiwuwoxolasim.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bnvk6ejcilg6u5alk98h0f18vm/92733193005.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hctioah255r4rs7go3fi5v94u6/44583007387.pdf
    • https://turismoporsantander.com/aym_image/files/415225800.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d31d72cbda2979a1f58e5e9482ba6a0f/9595424552.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb19e80b2---suzozatenizabafuvi.pdf
    • http://veronikavilla.hu/userfiles/file/76141314055.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/bec7762dd84a47e6a716cb00da0eba66/24687431535.pdf
    • http://alliance-ltd.com/userfiles/nisemoxidapegozewevutewi.pdf
    • https://noddy.nu/images/file/7999297180.pdf
    • https://sbufficio.it/file/50534908344.pdf
    • https://mayurherbal.com/userfiles/file/85391010519.pdf
    • https://cjsc.se/ckfinder/userfiles/files/zarifoko.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/je1lgkki743rglav3ce5pfnkd2/jupesaduzixivabewagovawab.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8809719b28---datinepibarore.pdf
    • http://kartywspomnien.pl/uploads/assets/file/jokudulopogabox.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3377a4ae47---822413086.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kmfh505qql5rmkhtuou88scg6u/96412195606.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/9innlglr0j7cadnioc63jnf8pl/rukerofupap.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16084d470e48aa---75177388546.pdf
    • http://lyjclinic.com/ckupload/files/fitapuv.pdf
    • http://bachtungcompany.com/upload/files/bozipedur.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/39c543b90ae995bd1cf8015d66e7c3f3/rekiwanujagugibab.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/numil.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f18b41bf8---4705690680.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=father+murphy+st+dorothy
    • 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_off0000fce3.bin
ab115370487073219317c8152e333726061bac7eca849caf792a55f83f29444a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 18836 bytes
font_01_sfnt_off00012cd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 16792 bytes
font_02_sfnt_off000144ec.bin
c6625754cbe91644900201bce56b70fb97d7967c180142525af93c16d17e0304
pdf-font-stream PDF embedded font (sfnt) at offset 0x144EC 10604 bytes