Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdedbabf18405f20…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 01:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c45ef9f1d4104668279236106496c45c SHA-1: 12face575afe1c04544c01ec379e805a0e1895d5 SHA-256: bdedbabf18405f20903bf51efaa1842c45cf06a96a0d748edc221dccb674c876
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, forming a link farm. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for malicious actions beyond simple redirection. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=words+i+can+spell+with+letters PDF link annotation
    • http://geasit.it/userfiles/files/8367014610.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8891986ec78de39bdd80ddc397d2d478/fevoponijizofadisovepe.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1d0104a4---xibaxomonibo.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/warili.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/wuvomitusen.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/jolof.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///16884514341.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/69181568663.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2a83aa8db---25726648291.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/84669536620.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/luruziguxub.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/29808236344.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/wutavilodemidazixaxivijox.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/82763222091.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/78965158083.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a07155369---29837910876.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/18208030787.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a528506601---28889479920.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/84499368460.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/86445821137.pdfIn PDF document text
    • http://nessium.net/userfiles/file/nidefapobinimoviliguzuw.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92470321369.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/fimugozawivabivagadosa.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210911140207.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/lumawaxodiwaxogumiwilula.pdfIn PDF document text
    • http://finchamauto.com/pics/joponixajuxakebigupu.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/26275135346.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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 16452 bytes
SHA-256: f7820fd2228796b71781d75b4a8a73a38a18eb87e1113775b8b706bfbae3637b
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10688 bytes
SHA-256: a6f150558a1d8326ecc8dd53029fbdc59e4c9a481554aa5f70634632d74dfec4
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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