Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e28426c7af0d22…

MALICIOUS

PDF

74.8 KB Created: 2021-08-28 09:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2403c9bdfc1495dfe8b3d8c8d762c02 SHA-1: 446f383c63ea0d623304d1a3b73dd4c514a254bc SHA-256: e8e28426c7af0d227dcc0cd791128c3230612358fa53413a1ca4a4603d2b303a
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 high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://freehajjandumrah.com/admin/admin/uploadfiles/file/mukitagixinizomoj.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102c7d114444---98728166658.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd871cc3d8---44099493267.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca47f41b9---82651682526.pdfIn PDF document text
    • http://distributoram.com/files/file/2218029938.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/sodixoxazatafe.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/pebokamuvimenudo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609fafe5d88c5---fifitire.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab001bb0107---93795243068.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160df9951be33d---xodoje.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c283d46cb8c---70864347618.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/21746323009.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/bufazewa.pdfIn PDF document text
    • https://akvaguru.hu/user/file/wolazeni.pdfIn PDF document text
    • https://mbbs.hr/files/sivawegilep.pdfIn PDF document text
    • http://bdsductri.com/upload/files/84810080966.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/72317299208.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/80vhp0o17f6vbr2h84nk1vkca2/28544931606.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/50708237274.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/vowelufadasopa.pdfIn PDF document text
    • https://soechi.net/userfiles/file/87249348236.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/jolil.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a10017a2---24475315498.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/95097004163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=no+the+day+bleeds+into+nightfallPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e998ee32fee4ec505add44bfb9c1ac76/18271394602.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_off0000c076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 10764 bytes
SHA-256: 02ac69cf5654bcfafedcbc0f244491ab830efab94bd6be811b055bd3d56be408
font_02_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 17100 bytes
SHA-256: 943cbead1827871fee0153fc42bf1637794461077846c4b5b6c76cf2e7bf326f

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