Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbac6a32cd0bb84…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 03:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b4294878e5e0656baf9e39db73db460 SHA-1: 25b706e89bc695d06801b767203c2d6175ce3e44 SHA-256: 2bbac6a32cd0bb84eec8acccfff5bd962cbe8c5a3fe2ca25794257164a6cf036
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious or phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://romalasergroup.com/userfiles/files/daputifusebiru.pdf In PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/99173358261.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/4379897721.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c13e5009a---63992216217.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d809c698---85633781422.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/92664750400.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/sivosakaxubajowuz.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/58596832160.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/9828954325.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/54131041218.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614690ddc35ce---92006848415.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/ranuxifezuliba.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f0294e6ff6ee5d15e8a97b9474d7e4ec/76517050786.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/33914897137.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/51424027671.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/vulujaruzalavowedero.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/wozegude.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161323b68f3d16---65972694515.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613859199bda9---7725649103.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109020254029714.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/41979938717.pdfIn PDF document text
    • https://cape-electronics.com/media/file/dorinawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=perry%27s+chemical+engineering+handbook+9th+edition+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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 11616 bytes
SHA-256: 652c560b61cd11a2359021b0fb6ec0364832498c01ba6d03944e306bde0fc089
font_02_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 18692 bytes
SHA-256: 04d5ce75325ac59c36cb9f943576e4daddeda35fd078f7253958bb08027b7eca