Malicious PDF — malware analysis report

Static analysis result for SHA-256 adccea8067d9eeec…

MALICIOUS

PDF

93.9 KB Created: 2021-09-01 19:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eefc8a40a256b6d0c3633094b46e7c8a SHA-1: 4712886062635560ed15b13f233623f6ffa9d635 SHA-256: adccea8067d9eeec73bdef37fc57c45ec71d1f71a7aa9c00a7ce24102a6ecd17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=jogging+for+pcos PDF link annotation
    • https://ctsgroups.asia/images/file/vufaxomoxetojibewumi.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/vesosekejemas.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160795b12bce5b---17613660251.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/272909753609f9dcbda3b7.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/mukalonurugu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43e7169af24a78d1bb810e8441899bf0/4546417073.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/ledelotud.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608520eacddf6---83381350022.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/96019983058.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160879227a03c0---2223303360.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/tmv5p84p3v05vbdnffdk6lhcq4/tewiratakisapagefifopus.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/doderagiregobana.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2b18a47f4df8424be790fbf1263f859a/38825109057.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec5455ac9---65347536365.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/57120460806.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/zalin.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lofisuvof.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/06e4bec90c3cb88a4706b2d5607f6353/12027951774.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/3636115161.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/69191fbec62e86275e07838ca389685f/puzajugimowax.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/57321970142.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_off00010b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 10208 bytes
SHA-256: e78908a528c7dd8930264ae0f0f2d2a920edfc5d98e9a2b602f6399ce6700e1e
font_01_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 18316 bytes
SHA-256: 7ba6105a88433710d4dd67d5d715808acabbeccdefeb2faa875126a0222dabdf
font_02_sfnt_off000151bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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