Malicious PDF — malware analysis report

Static analysis result for SHA-256 311f7849def2a53a…

MALICIOUS

PDF

100.1 KB Created: 2021-09-03 02:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ded5176e371682a3338819a99135dffd SHA-1: 38d7a21fc45c6384bda9ff470a3995a64a0a5981 SHA-256: 311f7849def2a53a32d4a9fc9790d1db3fcda1d44339ee88d110280c11648dc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c330ba9dac---11102110761.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b194143534---puturejowuvajufetawili.pdfIn PDF document text
    • https://hoongnau.com/upload/files/vunuwuxosejiwavixalol.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///jesotaseletujepizubuzazof.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/17619461928.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a627b0a4320---vemamageraruvemetegojul.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/60818024055.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/kisugisizeva.pdfIn PDF document text
    • http://svx.su/ffile/file/14307008636.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/vesibiliwa.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6007e30358bfd3de3d2a185c2d131126/xetapeso.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/85788303365.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/giturezaxal.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/a12aef7e3013a8880ae7ac00db260d09/37166378615.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/mariji.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8618b2d416---97866242457.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/gogijokuvafobibo.pdfIn PDF document text
    • https://onlinendttraining.net/files/31555522418.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4277bf85c8f8f9db00396beec8e9ee91/gibelapolo.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/xowovides.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fb48d4fd---73455458030.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/kidurolazifukadubegeba.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be0d481e1b0---80264450047.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/pifadus.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/fosasulitubegafolata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vtech+4+line+business+phone+cm18445+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 11220 bytes
SHA-256: 80e78be6a18a1bb83259740375ef6f872be722677f6c32d6c4bbf3216ef5541c
font_01_sfnt_off00013a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001528a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528A 18124 bytes
SHA-256: d55ae3bd24275f78a2483398be27c1b29a5f5ea54ff10d20e8770c065f91afa6