Malicious PDF — malware analysis report

Static analysis result for SHA-256 378d36abacb797de…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 19:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51ee4d3bd60bf41b1a8e33994f2e8cd9 SHA-1: 86ac2f1b57debbbd5183d65f531065059bacbe05 SHA-256: 378d36abacb797deef283fcfcfc2d35937da148ea94d5fe4539ef1a38266c646
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=streamer+life+simulator PDF link annotation
    • http://evaemlak.com/userfiles/file///98472060572.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/lubizorodiduzeduwefozu.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/wifemubopunizoradifatud.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/bifojegizurujaguvupenezi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/3c766835f6e5a347be9e2c84de1d8543/46521652659.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/debukigagazinugudikemidi.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/kasavezijukuxokotifutena.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/16926700120.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/pazujivexusokawowegusu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/c4i3r3hr5r51oppfhod36r19r9/zixogokovu.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/pugifipufofimoje.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/kupezopofajisife.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/4170859688.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/jezikewavej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301ca7a312c---dafaxasutamale.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133b376274ef---23929149920.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/xebitavus.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f25614f8---81121626078.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b909414b9b---70604785851.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ff6b9e08c1c48c5fabceab1e7af235cd/mebajipo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161402f640fca9---zopobomo.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/55870163667.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/46404746062.pdfIn PDF document text
    • https://jss-moms.si/upload/File/52831723677.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_off0000c007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC007 10448 bytes
SHA-256: 3082f961c382a5ad02e32a80518a70c7dd13b5595cadff557cf28a42d98786db
font_01_sfnt_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 16836 bytes
SHA-256: 8be40e481268f8483178ebbee96a9633ac51038c30bcee06410d68c34f68bb2a
font_02_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1