Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcd6a287b5b7f68…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 03:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 416f9a39a33bf11eb61a4d2be615c234 SHA-1: f5a42667d652a630c930ceeb627634f9b7a47100 SHA-256: 7fcd6a287b5b7f68f486efc97e81a3581a2dafcb17b2cb02746491c9012048a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The presence of numerous links and the use of compromised CMS uploads suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=cost+of+home+removals PDF link annotation
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/nafabir.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcaae7f6b---rizejigozomawomigiso.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0bbd7df3aef493d2c5da67621f35e73c/64550009769.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c050afd363654decf4d0b774d7519f7c/30024345889.pdfIn PDF document text
    • http://rld-carbon.ru/file/fanofanojosawogezumona.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/s6s1kdgfpls48jn6rc8sk46131/wejewe.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/7347104a1d700aabf4a2691b3ffbdeba/vujazepawedebonuf.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/22638829743.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/58786194496.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/susebiposogeze.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c3482481e85c813cc400f568375d1da0/97218496715.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5ee1443af9c054fd4904545cd47036ff/zopiz.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/vepiraroxunowosulutuseki.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cf8e3cc65a904164f6560276cca1869c/jarobofuro.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc64a7976a---47122792510.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/tateroxubune.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/tevusegadogapafulamuvu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/07911ef3a3b782171ac145f76de11e50/gamilegizuwupaweridiro.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/visupivamebesipeno.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/vodemubi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/mg70k1snpau89ic1l183cf2k57/komuvidetaxudazerekab.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/44452866620.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_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 16956 bytes
SHA-256: 082a91cd18f67e28df433f5c67390e05eeece266c06ed7b02de73b6f6ab122f8
font_01_sfnt_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001530c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530C 10380 bytes
SHA-256: 9b7a08475c8ec8a6436fa13183bd1d85ef39a932b476c615a748a78dfd77c876