Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5a3f660a423fde…

MALICIOUS

PDF

84.1 KB Created: 2021-07-16 07:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c01bc41ebea4c316557834673877fdec SHA-1: 20ed2c26304ec469d27e2c1d04e6e361a58863e9 SHA-256: ea5a3f660a423fde89fe66cce27cbb8eedf099e845d05988180d6ae3b413ea0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=cecily+strong+hot PDF link annotation
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8335181012---33107662878.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748691da40b---tuzevisudoladesamozu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c3a2989c5---72097162700.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9l2bqb8qpd3uhncfhpsqjv6m5q/62963133701.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/96121922708.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/9819530303.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/7238902162.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/nudobifagudinof.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/70664425402.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521031339729463.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9bd5c711f7b294133480dbed6587625e/banugexidoge.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed8495826e---62015808802.pdfIn PDF document text
    • http://wohingltd.com/userfiles/71707664040.pdfIn PDF document text
    • http://dzbnf.com/upload/file///wajerojesatefexu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/548c468f5d86cd350a1fb0b57096d2f6/valufole.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/11943900110.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xubizaminojajuta.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/jukabajekuvepufe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e4918eb4cb3f6337536c55825d46027b/85660028855.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c326fc872df---jokulikotikomax.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1710c66af547a35a313cddca2322990e/75692785408.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/100895146160c888a20ec11.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c737e9167---pivuvutanopamu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/92803329919.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_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10492 bytes
SHA-256: d4474318589a6204260a180437ee8f09c2bb26cf7ac8174c94b10c440ea098eb
font_02_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 17712 bytes
SHA-256: 2862918e45750dee5da8182ddd1ca663fa77e4be6551bc8d8e011c81236e6d12

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