Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac4f00b685812b6…

MALICIOUS

PDF

85.5 KB Created: 2021-08-14 07:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 12c8984dfa8007cdb09c05beffc0996a SHA-1: d31051ed545b8d7ddd0c65837bece104193acfe7 SHA-256: 2ac4f00b685812b6eb2c9b0eeab7bf8bced52da513458cf021d3c22058cd110f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as https://pistant.ru/uplcv?utm_term=space+shooter+hacked+apk, are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=space+shooter+hacked+apk PDF link annotation
    • http://wawabed.pl/uploads/userfiles/file/kilimifitenivuw.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/46050102145.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/farafixusowebutupo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/83757128241.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/gabumezusefo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg4pmq0bjfld3u07ro5ffggla6/161620726.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/wageviza.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/33444012448.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/40212296755.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/71853245991.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/f9reblbmas8l36n2bkaeku22br/70708924773.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/85693056972.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/mizomuzurew.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45c6b4919f---fakerapolom.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/11818950238.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/74838931047.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e036015eef1f0eb9569952ffb90fc21a/31941622309.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/38401682587.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3bbd5dac7b26f4f704979e99830e3827/33141655396.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160de1de2d0616---48859103057.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/zotiwekeled.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/sivopomene.pdfIn PDF document text
    • https://designclarf.it/file/5750891010.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210509041252.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607db825dcae8---zalunatujasojegatoxokuj.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 10536 bytes
SHA-256: d755071d1941d1f122c351e0a1ba59ba266c0e0128baae680fc1eeb5639682a4
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 16960 bytes
SHA-256: 4406c1b7a717b3b7996bc8ff4041dfef4865e63ed8f81b93d2a479e978bf86b0
font_02_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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