Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b957898af66d89…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 09:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2da8c0e9699cd0a3073da57db3021a38 SHA-1: b1d885af2e57e17d1e750ffc74a8c61c9d0b2032 SHA-256: 40b957898af66d89e0771d4708843778496afe747e2c71158c2b9ba5fd40945b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=android+lost+app+icon PDF link annotation
    • http://www.centrosanmarco.eu/img/news/files/86922269650.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/85748328662.pdfIn PDF document text
    • https://netlandschool.cl/files/98171160548.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/vexagavurofipizo.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/39064855600.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tudof.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/kuregosovenatifo.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/77839894905.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/36068509568.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/21849160221.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5ca424d842320ed61c68fabb4e7d4e8c/84561903822.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/70117653343.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091311230453.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/zitozoji.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/misuzu.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/betopogurapikexa.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/resexawi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0d0fe5d5e9c4df8fb655e3deffd4d0de/80552279441.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/pupojovo.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/32204006225.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345f4a09414---fogilenodumutazi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jokud.pdfIn PDF document text
    • https://soechi.id/userfiles/file/66829463911.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/zupimaperukigasojoliromim.pdfIn PDF document text
    • 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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 18056 bytes
SHA-256: 1ec7e41ef1c72e467e1f0efa532084aa37ba342114d6fa68dcf1468bc16b140e
font_02_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 10356 bytes
SHA-256: ac49974e72c758e5337429351bbbdcb3b951e18c26f8a46087a87a7fad70a7c6