Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c16be5f9850fea2…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 01:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c56a98f12130bfe15b5c4019609ff9f2 SHA-1: fc2249a7571a72439280b68c3e44f944a4e97d2f SHA-256: 7c16be5f9850fea202f3fdeb0f2ae7c520fe74261b95260686b1eca510d28473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://rulife.ru/ckfinder/userfiles/files/43473196739.pdf In PDF document text
    • http://ajitcoatings.com/uploads/jawewewu.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/wodaboxitizuxojunogixuj.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210916134525.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/gavuxanotugerazi.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/dixarifabigudi.pdfIn PDF document text
    • http://alptw.com/images/files/zasosujupelufekaguwoko.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/22784248410.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/73152047442.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4ecd2b134c61ed83ec02f093074070f6/vipofidisevejiwofotudu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6099021d04243c2fb678ccee8fc14bcd/47782904753.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/wuwilixejalosobunugon.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/58733150960.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/10067040224.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/fcad4fcc6a53a48ae52bec95c9fb806c/95640876687.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/16372291851.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111b0d4f83---vorojepo.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/71326506365.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/53587404565.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/30683368136.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/79352625382.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b906e4cc9c---vesikilevajafixomutopib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sift+heads+world+act+7PDF 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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 10680 bytes
SHA-256: a374cdc9bb1bb0ffd6b4c9318f76f1291021422f3897d98df253bcc0e2fe650d
font_02_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 15556 bytes
SHA-256: 80cacc96a2759c6eb6cb39f2cfc929447f93198bbed54ac1ae023c9264c4a8fc

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