Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89acb0532c8b069…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 12:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12e943a9887c2fbb26c959853a947cd1 SHA-1: e732b5d895fc880f6e51ff9f1dc3f7b85e09bdb5 SHA-256: c89acb0532c8b06948941a10c15fd13b3fa881ffd0f3d2c6c406a4646a57b01b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jairdefreitas.com/ckfinder/userfiles/files/mizes.pdf
    • http://terredellamagnagrecia.com/userfiles/files/darunokezivikiserivivo.pdf
    • http://prosquash.by/data/fisonodi.pdf
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/21024901933.pdf
    • http://madiagranitosilano.it/userfiles/files/2061238492.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/80173991111.pdf
    • http://marmaraisg.com/images_upload/files/patepele.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cd020e28063debb123de4a3bf9a3c99d/18000881599.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ae0131801364c94aca0a4fb0466a0259/paluraputigupape.pdf
    • https://dm288.com/slicice/file/2013616326.pdf
    • https://istanajp2.com/contents/files/rajutagoxikokik.pdf
    • https://xlspandoek.nl/userfiles/file/62266886556.pdf
    • https://www.adom.biz.pl/ckfinder/userfiles/files/terifamodezodikofogen.pdf
    • http://pengyou-english.com/FileData/ckfinder/files/20210915_CBD8813AE10A8082.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/lufodetodufemaxefeboma.pdf
    • http://zjhywt.com/images/upload/File/65896042422.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/63152711427.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca4ccaf05---41295099453.pdf
    • https://relans-nn.ru/images/docs/file/lapijepudukex.pdf
    • https://sharks-cz.cz/images/file/96653495063.pdf
    • http://alacarte-design.de/userfiles/file/17901963417.pdf
    • https://equinox-e.com/upload/UserFiles/file/49130447282.pdf
    • http://clanlogging.com/userfiles/file/bunexizeposalabupop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=yu+gi+oh+the+sacred+cards+gba+rom
    • 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_off0000b162.bin
f2cc55bd8171b1c22741ae87e281ac13df12bad232a6a6e431f11b7dea88794d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB162 10888 bytes
font_01_sfnt_off0000ca62.bin
0ffaddec8fed5471a50100a9871db25e695bb9463aa565041d45a4d38f3f0327
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 15452 bytes
font_02_sfnt_off0000f1fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 16792 bytes