Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b3f5f8b7a0a2d2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 17:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ae8b36e21b574e2a282d86d2c2ad578 SHA-1: f43eb722e3dbb1450ec9e58c3e92cb25249ead59 SHA-256: f2b3f5f8b7a0a2d2a608b5589a8c7098b8f4fef5a55d8bae9a30242014329e95
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. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely used to lure users to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=love+story+piano+sheet+music+pdf PDF link annotation
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/kogijevotewudixapusagigo.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/zufubuvedutesebami.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/45548129616.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/xekoditokode.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/00c2lhtau6386pp40n846pmlb9/rokilosemewofazunira.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/pupeturozajoveno.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160725bf6e4fc6---vurutowinalaxigelozo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d02d389a---45825130129.pdfIn PDF document text
    • http://zerosquareonline.com/file/55844650114.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/kanunaradibixanizi.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fb5a62c80bba7f05bf3b6e3f949acaf/vodepi.pdfIn PDF document text
    • http://teraval.cz/res/file/59233457174.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/sukogulurapun.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/15930400885.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/443199536.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ce9df12a---redepalodezeniv.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/13790010117.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/jekuxiwugiwiraka.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/woxexot.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/90380290615.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/85995728309.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/10413576423.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1417c2e10f---bisopemebe.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a715f18b86c---745772334.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fb69939c---71245464237.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/pikid.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_off0000c0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A4 11076 bytes
SHA-256: cb28adefb6c7ff7abbf41a1d4276111a1493533268cb1f35956fe1791a49777c
font_01_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 17100 bytes
SHA-256: a661f44160f4d6fcc42de01ec86df0194308a0c657fa54a07a490d25e8b61765

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