Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbcf8bf02b7f4b7…

MALICIOUS

PDF

91.6 KB Created: 2021-09-12 08:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b20fe1a3d4af9d52a419ef9a6eba8a4 SHA-1: 6ab521e73941b21514690bc7f14055c117d86c62 SHA-256: 5dbcf8bf02b7f4b775db77a67cbf44ce39f925f8ed547506d184113a6f8efb17
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple distinct hosts, some of which are potentially compromised WordPress uploads. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://thingsantiquesla.com/userfiles/files/86453422153.pdf In PDF document text
    • https://redac.ch/upload/wemagukajovuwenazolog.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bd779d0dddda36a0f3016aca5b8e85cc/16749938436.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/mamogowewelebinez.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/22293853938.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/39447143276.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/16378685290.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/mebasofazixewekasomanu.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/xedegiborixewizewesij.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/niderimibatamelolo.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/ludozixikopagakipegusekup.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161383a37da3f6---baforalabokiwulitojusogi.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/65381096942.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/4694617525.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/lawigi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad83e64ca---7269327437.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/88126064180.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b3fd12f0a890029c2ea7cd6fa89e7f1a/fedatipenumapebuporapoje.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dhr7sheojpabh3ki88qln36sh9/gepilamanofegat.pdfIn PDF document text
    • http://e-sheremet.com/img/dulenunegifijusud.pdfIn PDF document text
    • http://zeci.nl/im/image/guvopejiniseral.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zilejuxozevofodamizawebav.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109062307121048.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e05be3811---29161246768.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/gelevizimod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+action+games+for+android+onlinePDF 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_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 17972 bytes
SHA-256: 8f6fffca40e6d25b0f65984a29ef604cce881e3ff602474c82b2ac59ac327fa0
font_01_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 10872 bytes
SHA-256: c45aef77924c02fb54b19b989b021ecc876bf422ebd83def3d6faa2f2b15c026
font_02_sfnt_off000148ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1