Malicious PDF — malware analysis report

Static analysis result for SHA-256 989b55c067b5efc0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 06:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c9d37f1b2f7dde2ee959e9deea95611 SHA-1: 8ed382703fbc33260c56d6e3aa3d28fb8cab2c81 SHA-256: 989b55c067b5efc0900fcc69e54e17b8342d77b3034c5ac2984eedddf354f318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of multiple distinct hosts and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://psfund.org/public/uploads/files/cms_files/43786162352.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/04dhnvhs1g2q3fvnosmpmlpaj4/53041852288.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/aff11e90fc9886aa0131e7262362015f/17760277848.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/15023d53adb4316766b214a5911fd6db/latolekirat.pdf
    • http://wish-pharma.com/upload/files/guvoziludepatebozujo.pdf
    • https://brakos.it/file/68017203191.pdf
    • http://hrt-foto.hu/_user/file/90198823325.pdf
    • http://vzwsportenmuziek.com/content_docs/81893407836.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3c8441459f4f6cf61043d49fc9f74e8/vilofiwe.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/a703ija9ikr2lkrdcgqeel2jid/60152295836.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e281d4417a0---terewupezowomifawudup.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44dd254d01---60486831071.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73e50da30---60523734013.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a12b9b537---22749371254.pdf
    • http://calebdobe.com/clients/875189/File/sunukulilevozajufetevu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e38af715---16473835288.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d7bd62ae0a5b0c1d6b6ee21fcc681aa/bonevilumiwokinowuxota.pdf
    • http://co-wemart.com/careeruserfiles/file/mozisa.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160714573116dc---vofiravosurogezufel.pdf
    • https://kuepancong.com/contents//files/sokujekipabipefo.pdf
    • http://paskolik.com/upload_files/fck/file///18151475941.pdf
    • http://traiteur-ribot.fr/userfiles/file/junoxokalafugubodukubeda.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/23331071821.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=5+pillars+of+islam+worksheets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b734.bin
1cd69b1af1a639e3a2392effd469fae8f8da9d8e616405833a07d1352885fdfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xB734 10732 bytes
font_01_sfnt_off0000cfee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 16792 bytes
font_02_sfnt_off0000e800.bin
7f472e7878bb5309f959d67c6ed14c00cfb61a68f9e11384e15545fd61216f28
pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 15948 bytes