Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8f7f7cebc3bbb0…

MALICIOUS

PDF

92.4 KB Created: 2021-07-02 03:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c37f47cb8b89b08f1177204ba67eb36 SHA-1: 85e9781e8ed64b51e4208674b08f405ca896c883 SHA-256: 2e8f7f7cebc3bbb0d5c008afc39c8fd8384445b29ab950458b43a1a4a1666839
196 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. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using SEO poisoning and compromised sites to host or link to malware. While no scripts were explicitly extracted, the nature of the links and the detection suggests the PDF likely exploits a vulnerability or redirects to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://arvikabc.com/images/uploadedimages/file/7894567685.pdf
    • https://dm288.com/slicice/file/mixuvo.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/31073392349.pdf
    • http://canhtoanland.com/upload/files/nugakagerevaju.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f7d9ec71427db6705c2d9f50cfaeb266/43790710837.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/75c857f66e7ae24f3404115d2c2e6c97/tipokesuturize.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f33l21qga0ip6vcl6d25gnfdp7/gaxefinuxav.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lt9kcvn63bgl3mvr0ouv3srftr/96464443519.pdf
    • http://hyosangjo.com/userfiles/file/20210624231629.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3fb76106b3376f53b4a22027e4e10cde/videp.pdf
    • http://pospatrans.cz/UserFiles/File/dowelidijex.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/30352693808.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088df9e88b17---xubala.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/cde75ac44b8bd7fb1f89163def5762b8/novolu.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/bodowumibigotedasa.pdf
    • http://stellamaris.cz/userfiles/81197071350.pdf
    • https://unserbiokorb.ch/userfiles/file/61119966073.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a22e99677---97247802595.pdf
    • http://agroanaliz.by/upload/editor/files/velusovibak.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a489b65741---9727483802.pdf
    • https://davidfoleyinc.com/userfiles/file/57739588359.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/duh4dkpo42ifs0khh6gfdfo0bb/20245792648.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/p35lr52gbjq4onvecqucrtj6s3/wizajonepogukajuvumo.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fpfs28vu54brjhuvtn00h9ld3a/rijimodesuduxosejidasiw.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/5d7f09314a339d72cba392fff9253a37/70945795976.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3383ub43munbk89vpfhh7qsll8/wuzajosabinimekupega.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb07f62b4fc---91412507920.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=online+free+convert+pdf+to+excel
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e892.bin
a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 16076 bytes
font_01_sfnt_off0000fdb0.bin
93dfaa9f538911271f04b8911c9dcf1023f7616921adc42a631c27516078c3a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 24500 bytes
font_02_sfnt_off0001336e.bin
fb2e3a814fddb61625deec501e973443220caa97d13fc62023045a477c4c9bc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 10476 bytes
font_03_sfnt_off00014b61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B61 16792 bytes