Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f34d41cf9d05246…

MALICIOUS

PDF

87.4 KB Created: 2021-09-24 00:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 214f2ed663fe5ed93c0dcd034c83df9c SHA-1: 779a5f10d83b410dce489a34828168edb580de5d SHA-256: 3f34d41cf9d05246d320dfb53f5ca1db925e01ebf3efb30e6c6655e85d510d99
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=run+sackboy+run+apk PDF link annotation
    • https://samsungklima.net/upload/ckfinder/files/botedibemeresujagul.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5b980c52f---dupulegutunejavijavok.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/zojosesuvuwotirumokadeve.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/nobozogapuwor.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139271696351---mozebesezepavexukamije.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/35523521631.pdfIn PDF document text
    • http://mimpidia.com/contents/files/buboze.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/63680774692.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/96498275013.pdfIn PDF document text
    • http://strandedtattoo.com/file/ritexuboje.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/jivebavakibobixo.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/19139402212.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/29567606672.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417d0d0091b---96024702368.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/6560707216.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/24669996809.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614165f4b7a0c---1383761579.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/52917707394.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/sibojawewomopago.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9002850ee2f565b9b959a75e179eb51c/beganovodubunumejepi.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/56728080341.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a209daa4fb---47555097083.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/vuwinamubodumoveruwobaw.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/6663278179.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/zagunepevomanelurukisim.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gufosejererome.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 22796 bytes
SHA-256: d22ea7d53bf20b09af6fc960d2d5e4c2892d5de693c5ebd080024664d2d41c25
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 10492 bytes
SHA-256: d4c0e8448facb093a8d31e593e45a5b2ce1b51f8a29ea5a92ee1a203c6bf4928
font_03_sfnt_off00013a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4B 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137