Malicious PDF — malware analysis report

Static analysis result for SHA-256 06be16e1178f3bdc…

MALICIOUS

PDF

96.2 KB Created: 2021-07-21 17:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cc01bb04e0239f8b9a21c10473bb1b8a SHA-1: 6cf951b2754662cc16d8445003b59f61f16f8c51 SHA-256: 06be16e1178f3bdc7d424c1e8072b78f0f942477a0723ab796b313706f0c7cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/31529f3fejsjphlr1de6ebdh78/vikunobit.pdf In PDF document text
    • https://stratasphere.online/userfiles/file/48915560404.pdfIn PDF document text
    • http://prestopc.it/upload/file/36187065037.pdfIn PDF document text
    • https://irantruck.ir/data/file/63365553116.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607031b851428---39015553667.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/lovuxe.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/296a5b8e95ca7d31bea4b2a572d07345/dapidupelebubojetuvenej.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0ff4b2fb4d3239632ca0e93d32e358ac/vipanopuvadesixozodubaga.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a902440ea---48938554167.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ec215e405---17136285532.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/5245823972.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/23390660195.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789d1f69474---fowogegosorisaxaxaloful.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wupilirinuzipug.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/wusolo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab26de27646---fididazusidebufedude.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a970e938b11---45124546578.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/97317666048.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/rawupumokoser.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/18mdms75hfhggshq5detdlio27/6541462430.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/5651577391.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/pibezikenodewuxunu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/76ae85d3705c96a04274fa03c0ffffa6/garusatizuxaxebujutoselos.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3ae6844e164d6ecbd1dc98d916604ec7/bemiseniresafurixelo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d80de6d07bb---ditijixepevewidosatemod.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160889b012b63f---gixafebuzafuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=logitech+clearchat+wireless+usb+headset+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16628 bytes
SHA-256: c2e94979db2418cc596402c577fd29cbdc35656124aa629a5e5f9f812ff0d954
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 22348 bytes
SHA-256: 6c6f9034b46529038162400d1ea1b6623496c87cd838b93a74f99de44a93cae1
font_02_sfnt_off00014021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14021 11100 bytes
SHA-256: e30c3ddee62f46b35b400abce7f6b6f82bda72b69ff5720f7a6cf66eaa2941a8
font_03_sfnt_off000159ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1