Malicious PDF — malware analysis report

Static analysis result for SHA-256 16032a70eb448f11…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 14:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43cffd3d86af00c03e230041d5385ce9 SHA-1: 26fdb3b7462cddc4f2ae12fe7aa8e127a4caa453 SHA-256: 16032a70eb448f110d99805f770c1524fd0ca961e9ead8542a4724c7390b5b96
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

Heuristics 7

  • 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 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 http://bilateralmatters.org/userfiles/file/luvakil.pdf In PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/vewenebimevisuvusopud.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/97290654032.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/nesogififa.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/44536353376.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/647fcb6873560a9954a80105c06026e3/57428173813.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/verunutenedimalapalun.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/76555984554.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/sarapofisomelave.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/zofubuni.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/64920030124.pdfIn PDF document text
    • http://usateatop.com/_upload/files/71742984228.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/4apgofbuf6hlfbohk9keihh192/fabefovur.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/sfmhvk20g6ufmihcibin44rgr6/16459451466.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/91847657371.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/minonanusifazubexelimovug.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/35417796378.pdfIn PDF document text
    • http://01host.ru/userfiles/files/fesedumonuwog.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/vufadujolijowal.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/91058493723.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/23839512802.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/zunusezeduwekin.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/13097671088.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2914e6a9a---lewisokuvupagivevunu.pdfIn PDF document text
    • https://anaksemut.com/contents/files/jizor.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/40397667912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+1+mod+apk+sniper+3dPDF link annotation
    • 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_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 10708 bytes
SHA-256: 60bdac8c8156483d9e7885f6726edd83e329d38449bd2955013de11e4688b073
font_02_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 24136 bytes
SHA-256: 30fba09a36b45518394e5051c7df993b49b92f78c97c743c6d0ff5cbecf34046
font_03_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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