Malicious PDF — malware analysis report

Static analysis result for SHA-256 5713f332f080e22d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 22:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0262e28c73e7b5013779fd96c7804e51 SHA-1: 3361877efae018a06e423abcc95feec9fe243e3f SHA-256: 5713f332f080e22d419240e92586e63693253cb62d626fc82f2acd8bab1c0d25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The file also functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and other disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3573e56f8af0f6bde8facd68ab1c498f/13243521960.pdf In PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/31564856563.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/xobup.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/kazefovidoxijanawo.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lisaxusetej.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/66040327442.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/72622235707.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/33123771794.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f596f9e4dbe---40970340500.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e6009456204---81949792155.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/39833549247.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/livopegusokuliwatib.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/savolewaw.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0blciddm24iocl2mcm603ubqsg/misinesixelinapa.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/56393602675.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1279951acd---zegekojovazibesirononavo.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504101309357229.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdec7df75---61509976105.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/87355880471.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1411fa23---35185890657.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/43612317065.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/96003792093.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/mikilezepakinupe.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/55966241209.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/75370022695.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/51960172368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=list+of+adverbs+in+french+pdfPDF 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_off0000c54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 17996 bytes
SHA-256: 68159fd4da075a071c0e7c3aa9567f14c8c0d5dc7f13ee61d2e0f3cddc881359
font_02_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 10836 bytes
SHA-256: bb91680e94100f7f23192f12ae43ff9dae657e40030709e5102dc81e06a0be7d