Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3937f788f2140d…

MALICIOUS

PDF

89.5 KB Created: 2021-09-02 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 146c1197cb2c0f979e59325a5fc8daf1 SHA-1: 41b3ab1126ec975ef91b1e32d95483a76dff2d52 SHA-256: cf3937f788f2140d9a4caa63849790a5bd593022b9c519c791e330a565b02ff6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://mollis.rs//files/pepelatewepipona.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161234ab57ffc7---mebofif.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zozozasabajonozanewifewo.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/36838291288.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/22156735237.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xafepiwavedozabekepas.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dc2113c3c7bb6064930a1af5f05d9522/sinix.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/50603659469.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/61655723981.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42dd4d384---juxebukipegotepaz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/uvmte2agkaedl6pscejisqe5pv/jopamiritomalizaribanawi.pdfIn PDF document text
    • http://gchs1966.com/clients/2/2f/2f663f305105093038a7fc4b193dd8f8/File/32692133815.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/kprjdi4bl55f5e38grurik5j2u/xasivamowibefisogoteje.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zodenenu.pdfIn PDF document text
    • http://kme-kme.cz/files/file/vejafixosinuwekugar.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bc3741212053943d65b50dcb2e94f91e/78492537243.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/xusevataja.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/79758856509.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb6739c62---wixipan.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108090634066777.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/88184411886.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/93464054138.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/16130065662.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/kelazizuluzavagijiritix.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d303eea7031---7177362471.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/31727197177.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4p2kfehvksfmf9euipht02s396/tixoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=round+bar+weight+calculation+formula+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_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 19320 bytes
SHA-256: a2dbf3bd6d1877895362ec0cb53f002da7262dccfdea6a307cb70fd97d0dc43e
font_01_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 11268 bytes
SHA-256: 6e3420a83922a7eb198690b44140f49c17e6d5992729d90ca213a9c8a946a4fc
font_02_sfnt_off00014063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1