Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2e818e5f445230…

MALICIOUS

PDF

97.9 KB Created: 2021-08-20 14:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72189ebff7f69b695d8b6fc9dcdf89d6 SHA-1: 21b3b9c5690824b4e8e64245f4876deb02dcd9dd SHA-256: 5a2e818e5f445230da262591603d94b27667a7bfd09529f41f671a5d1890914f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicates a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, further supported by the ML classifier's high confidence in maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://transporteslaplata.com/imagenes_web/file/21817659939.pdf In PDF document text
    • http://polyalpan.hu/_user/file/goxamorotiniziziv.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b32bce37---87911141563.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5ad53bcaf6d0c92da98b630e3fa80d6b/19096149856.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c06778166a0e6cc5dcd4e07f0c40aecf/1132162687.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608507cb455ce---59341122771.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ef440c6dd61aba5e545cf0209d82ae72/lopiruvukajesipiso.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/foxewuxew.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/74014765026.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49591bd84b---29617262324.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704c79b0d89---46305165810.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/861f7d8c2d64fdd71e36e796bd3f05b9/zazurovidowajekijikir.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/85261786206.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/82000207860.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/30970775da0575db1ba6ec3257ab70e1/90148995860.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/lnqmu2vf2lve4jnejdbcq3ko7d/9616627173.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d71e48e2d2e8342365b3f87b71a37faa/8108110673.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba478ad9b---gelovivo.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/rejilito.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa903c65bef---xokodegukanaxikovenodudov.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/gozewabajofunowog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mise+%C3%A0+jour+parrot+minikit+neo+2+hdPDF 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_off000114b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 19556 bytes
SHA-256: efc89efcdf3a2dfeabbb9f6eb0aa72664495b89d683e7e35889b40d3838d91c9
font_01_sfnt_off00014557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6E 11232 bytes
SHA-256: be0f91fff23207c9ebb9f90cf151072565de87d580dc87454be0cf4ba4eab3ab