Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb1c27b6c28fadc…

MALICIOUS

PDF

84.8 KB Created: 2021-07-06 22:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b304cd0860e9503a884ae3b89380ff84 SHA-1: d74e221522c3c920944fbf6d8d8ae2c211f4e4c0 SHA-256: dfb1c27b6c28fadcd95e41f7d79b7ed8ebc15ab823c733eb73141c610c014508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicates a deliberate attempt to use these sites for distribution. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://lotteppta.com/beta/assets/file/tefarolewumu.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faecf63bac---19286526640.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/92726994643.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210624014316226223ugaoehvh40dy.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1dacbda6---fakovajeguvedodidujifom.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/retuxibameroguvuf.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0440ddb2---bodatixebiwunofabara.pdfIn PDF document text
    • https://tavio.ru/files/file/suridu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857292b66b8---lijedejaxeju.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/8130358810.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/91869119449.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/41d392e76e3f13143c6e1ce49daaf131/wifelufivivepabon.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/65365829047.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6751f208a---vaveluxu.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/91536967937.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/20170996377.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609833960638d---239509443.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/fesox.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210602/210602123820643710jvblzgoy1mgf.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d60f4226cf7---35259261667.pdfIn PDF document text
    • https://egf.tw/test2/images/file/kexujazisededupitonovur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=half+life+of+a+first+order+reaction+equationPDF 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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 18352 bytes
SHA-256: 875594dbb79651825a9f2e7fde4962c6134b1d0e3bb875276ad6c5a32880a083
font_01_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 10704 bytes
SHA-256: 581b0239c6f1a50388f21e81c646eb9622699c883166808397437bfd82f4496e
font_02_sfnt_off00012dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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