Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fd7e6ce7e7220e…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 04:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51c0a00981d53b81dbe5edefd996e705 SHA-1: dfbf5e42d5adcb6cda4bc4da7526fd60848ac5cb SHA-256: 38fd7e6ce7e7220e9e1586f7ababb6d5c949f8345145bddb7e00e1bb5a928591
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=best+photo+editing+for+pc+free+download PDF link annotation
    • https://balajitutorial.com/admin/userfiles/file/9462723763.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/futobebikirufibixogujaro.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/mimiwafuw.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/28886143210.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/am6vtfiqvlnk4nhfdpp9egcsab/60819032678.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/71377382523.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/sozesawewekuxoj.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/lidokagatozilimufojuz.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/90244518110.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-11/20210911185651143897.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/89977965585.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/66567325176.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/59641828915.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/jewewowuromofusifetotux.pdfIn PDF document text
    • http://futboltotal.net/images/files/bosorowivolakod.pdfIn PDF document text
    • https://robodom.si/files_vsebine/gipaj.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8a24c455a76cf762a98f7e2e40334f6a/xagapirulinegizami.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/69813464873.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/68029149801.pdfIn PDF document text
    • http://scsychem.com/upload/files/50567963458.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/5719097772.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9c1698e70---45113040055.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 11036 bytes
SHA-256: 425774f81183e532abc0dfc3fc6375856a5d27e2c034b42235cf4db57461ce64
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 17136 bytes
SHA-256: ef5179c9c55d5036f34162809875e6fabb63f6cfc4d1c42d4e86f281932128e1

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