Malicious PDF — malware analysis report

Static analysis result for SHA-256 8617cf9c1803ea38…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 08:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f5a07d9ef53d91590de8c47a3be5fb24 SHA-1: 2b00c78c928d40912f235cecbd18f5ec9ca9c48e SHA-256: 8617cf9c1803ea38d863002dbf76dbde8cad2333af2b6a6110d2c1909122e126
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/mcq9dmr77hvr0tsl3ln0a5r178/leluzimogur.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5290f4b7b6555c7656e39f2b1c5cd48c/dexujoxejojan.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/973113921.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c7be2033bc791b789da45aeecf079e6a/16717574528.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e685a09dc6---misaroxikilumilofap.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f8f964ea03b58edb343a601473b96f9/guzomusepesidap.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/64446734947.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e0e4916d2---75870621259.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fad69a97---zekabubemevig.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/woruxavesukadisobowexaw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff506326fc---27516678152.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d63e9e11f6c4f78f69c0d949ca7ec49d/71998551881.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mawokapasuzowubukuwovuf.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d6a0ba03---34279260312.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16086834ec64fb---levegunewapafa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba02a66e68---82524971636.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/h1sce203capmo5a7g090dpl807/papidoxumegogoxed.pdfIn PDF document text
    • http://amandamaitland.com/images/file/60079317852.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/69429627785.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/51c113fe229e3ee0f07db70d091b39d1/jewixonafo.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/fodipivowalakiv.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210615184428_1673222452.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mifesexogeja.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13944b01f3cd270f504a4f200b4a30dc/mafijoti.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9f6991da---43714163761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sea+of+thieves+free+codePDF 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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 17856 bytes
SHA-256: 8fc742221d3c882a2e919121f9e51ca494f8a387f5577cafac93e04a60c1a598
font_01_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 10564 bytes
SHA-256: 49337f9904c75f2c3046ffac2730fdd6913b9588ba55670e3d810d079218091e

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