Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecad4ec254e9bf14…

MALICIOUS

PDF

86.5 KB Created: 2021-07-26 14:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 92877ae26102a8471be35d8fbc885a5c SHA-1: 4c79010e0bd0138b708e6a75ac368f681e4aa79e SHA-256: ecad4ec254e9bf144449bd1cca6e5d4530210f6af949e9bd2358c5a7f9b93c53
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these are common tactics for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093752d5a882---bilijurogurilatewiwozo.pdf In PDF document text
    • http://centroolosprato.it/userfiles/files/wuzexapuwafowupijunifa.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4k55b1afcni5eihf4s4mgm98mk/53339178409.pdfIn PDF document text
    • https://negaratoto.com/contents//files/dijilotori.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/lurazewefekarejak.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/63711341477.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/wajogoxagenuwi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919680c54b8---bofewudedepiregupej.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/55144013528.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/26652600829.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f08d6dc9e---2864405251.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/85466114286.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae434e1d1---64019864182.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ba90a3b285367fd09b5db8b76e9ade1b/73258751546.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/46af8e04fc82345d93fc6d5f6ed5afd8/balojofitanabelijalo.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/kulogow.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/17690523467c2fcce024214a6f890167/40241532344.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/85102f48c45047fc807695b4bcba7937/30820944913.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/9vaf3h7h40rlgavjn3c0kq77rd/vujipinavetovutelujisa.pdfIn PDF document text
    • http://vtaky.sk/media/file/42183563324.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/xexod.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e810ce40329---kejawakuwemodoxema.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2970b29550---31656526761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+resize+a+watch+band+without+pinsPDF 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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10940 bytes
SHA-256: d3f514685fcd9eb7b2f18602d7c62de6bf48e8e0bbaf438f34947fa949fcf2ed
font_01_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 17008 bytes
SHA-256: 2a8abb9e1f13e0f3ec49e04c2e99550d9c3ddbc65bec626dacf3484d6110296c
font_02_sfnt_off00013366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1