Malicious PDF — malware analysis report

Static analysis result for SHA-256 c541f2318ff6d78d…

MALICIOUS

PDF

160.3 KB Created: 2021-07-01 10:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f877093d820e2b5f3fa12840d8733845 SHA-1: cd255bbfbf0bc07847640ef9cbdd5be433722157 SHA-256: c541f2318ff6d78d8d669969966a76f97c22f2b53900f72b31d95b18628d7ec8
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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=chart+of+vowels PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e5aef6149c945902df9216d4db395d55/70800462465.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/5agrhjopcv0oekgdad0lmk8vn6/foxorizizoreviponemab.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/ronubewiwabu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/dbadd01ad3175cc7184625cd640bc83f/noninanifedunobixafom.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/903a20adde9fed11a9c75ad9e3767f6f/xeximibuwabi.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/dawidezusorosesinidur.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/sigivuwazupokujifeninoz.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/86125884990.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e8d7a63a1---70369877615.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/13332608198.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/74468328629.pdfIn PDF document text
    • http://maidichike.com/upload/files/gibiwigibufegapizepe.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf6000d62---vabisofolelejabuf.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/e4ubt4j3e88kato3akdhgsgj8g/83631941993.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/fb659312062329876c2a1a69e7fd6ddf/bitelowuguxojori.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205653b75a---11705329083.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eabf20f16---35744199314.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/gimubozojawupinulufer.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/lbmsn6485qed83o45fag83qt7n/70671184208.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0ebdbe03---6199377882.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/defabi.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tukuwobadoki.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA00 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_01_sfnt_off0001ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFE8 25300 bytes
SHA-256: 6c7d9295811443203c4b160ac20adf9af204deb183bc4d05048be5f405987233
font_02_sfnt_off0002439b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2439B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00025bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BB2 10300 bytes
SHA-256: 003f2a531dec07ab36efa12e3fa2261eb82183c927dc9824c5c657b692aedf98

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