Malicious PDF — malware analysis report

Static analysis result for SHA-256 8473963890042aba…

MALICIOUS

PDF

85.6 KB Created: 2021-07-18 01:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69c9b7a3589e10e63e09a44e124028c8 SHA-1: 9f822df454703b8bfc3467e698c239b5e0199f2d SHA-256: 8473963890042aba04d1cad98ce8d0035ea7fd04168b9b9a9a5cc906bc55af33
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external links and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b2df1b273260caa251efa79555accc8a/tinimepiv.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/095259d93930db5ed35909f3ce97b4ab/buwojivuxuvudaku.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/82318541377.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/nipawugaj.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6a0ae4e50125dfe5d92beb5b41fe45b5/90330535416.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ab2c742d---31907207144.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/33600868528.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bedotekifeluralavusarig.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/99580015536c9ed66de1a0e634e82223/17370523580.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/16632416564.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/88161722609.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/lolunivudaga.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6f7e3180ab6ea1199f12413f6792823b/18552725569.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d4c503bee0ac07d072d8f4d3d14337c4/94651953862.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e771431be55---29334998843.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b37983a491e526c6a72e52415d271c10/74104056019.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/13468484479.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160916506be0fb---84372992963.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/34e432012e749b8d8c73f5cfc28e4568/91469558619.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e33f14319---kuxivitufer.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b4172121798---gajigase.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bka2c1dd8masujg0o9tk8qcbm7/fotozubixesetolewa.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847bed739db---lajexewalamabaguxijemugif.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/kalijujijolomizodinuwekin.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/87251191331.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/1d48f01973656011fc5b1bdbf7b55ff4/62423669565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+know+if+i+am+fertilePDF 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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 10376 bytes
SHA-256: 9d503425ead8cd7402c7b6bf868bed7c489092a829021c509bb0b6370dc74151
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 16456 bytes
SHA-256: 2ebf3c1f0fbde4fcc07601ce5f27f1d726efde533b7ec2c08ab7f8e14c36f26c