Malicious PDF — malware analysis report

Static analysis result for SHA-256 6483ec8c81ff2c50…

MALICIOUS

PDF

89.3 KB Created: 2021-07-08 12:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 400dc0ce30e461873c8308b7a6e59d32 SHA-1: 50a55038af5f946e2e4659c6be3aef3213781655 SHA-256: 6483ec8c81ff2c50917e6b7bc1c6a8ef54373acc1adb5b4c8ca2019697073896
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=carrier+siesta+window+air+conditioner+manual
    • https://bilegt.mn/userfiles/files/4108261876.pdf
    • http://metaglas.kr/userData/board/file/16590981249.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ce76fb62---winafagowal.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/kisinub.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb73e92b776---rosafifukumomiva.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe4832a000---dekawinemi.pdf
    • http://euro-ex.com/68044911123.pdf
    • http://hongshengfish.com/uploadfiles/20210523/2105230953146778552kt73yt8i34o.pdf
    • http://sushiloverca.com/uploads/files/23035040231.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2kibirnis1hkjag5ebd3n88g6f/ruwudiwopataxizefosi.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6367c2ef7---pibegemom.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a627474ad02---jeduwogixiwotovulelo.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/42752499161.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074c5ac1b4---17834960488.pdf
    • http://pamat.ro/UserFiles/file/mokolevalerujefuluta.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/94441471124.pdf
    • http://rencontres-icare.org/userfiles/file/fufuzixisixuwufeni.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738974138bf---vovekaniredanudugewufil.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5e757600---guradimevugola.pdf
    • http://afghansolar.com/userfiles/file/63996528779.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081da40a53d2---jazisigugekerimanoxeroli.pdf
    • https://guruamardaspublicschool.com/userfiles/files/vasexonokuvu.pdf
    • 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_off0000fa10.bin
ada2f65d2f67b6eb2f570d65f86d4578c03532dab7b9b6738640dfac23242525
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 10748 bytes
font_01_sfnt_off000112d8.bin
712c40926d118905f8dc25135c230ed26380ee0b0fcc65ca938d0a94dd58802a
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 17112 bytes
font_02_sfnt_off00013fa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA3 16792 bytes