Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4075628cd4bd0a5…

MALICIOUS

PDF

80.2 KB Created: 2021-08-06 14:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5380bee1ac33e3a2473c0f74a085201d SHA-1: 8d8c93dae1b0fb7e0595948cc1fcdddefae3e61d SHA-256: c4075628cd4bd0a564943483f4d7283fbc80780729046c3f69e8c5c71ecc1468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to manipulate search engine results or phish users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, possibly involving embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://amitadevnani.com/userfiles/file/todon.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/tadakifakuzokexi.pdf
    • http://igabana.com/upfolder/e/files/20210805080401.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/76842c54ed23ec3b5cf8387351cae288/tumukurikuvi.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/18c5b00d84ffb677a2edcb0614804c3a/jakupufirikafadutidusebi.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/etfuo58l80lc99kq9iivii8lim/62324187816.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1f6o231jrol8cn9m7jlpcs6er5/22808255748.pdf
    • http://khautrangkhangviet.com/upload/img/files/bezutisisuvit.pdf
    • http://czpohledavky.cz/userfiles/files/89952208847.pdf
    • https://mclarenquartz.in/ci/userfiles/files/53506066541.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8346b7824728679f102834e92e59a6e4/jizajigu.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e0h266pfusaa61e0jdokqeei3g/14311296735.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rr8ovqoj2sob54h7js2kq5hf77/sarup.pdf
    • http://elitaliaweb.it/upload/file/lufusiniwesokakur.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/11562678252.pdf
    • http://thedewakohchang.com/image/upload/File/iribovagekuf.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c358d193f8---83500245807.pdf
    • http://aapltd.net/userfiles/file/lorogizijufubudefokokaro.pdf
    • http://www.cafeinca.com/img/public/contenido/file/ligaxiwevofimawafefo.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b485b14066---zenibizonisabujenisenatim.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/bemidemedafinega.pdf
    • https://alzubidi.com/userfiles/files/sugepuzonesalis.pdf
    • https://kurtoglumob.com/upload/file/gepovofaviwipalopofizu.pdf
    • https://emauto.lv/index/images/up/file/89581461612.pdf
    • http://castrolmintabolt.hu/images/upload/file/gotilupasikuxinudobafoka.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/sobajegupuwole.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kenmore+dishwasher+repair+manuals
    • 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_off0000d4ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 16792 bytes
font_01_sfnt_off0000ecff.bin
d25f3c063f5ea9c24c57dc4681c6da7a27d69a25b02de680ea6255b781be34d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17328 bytes
font_02_sfnt_off00011a5f.bin
718af3c0e7d9cbeb47bc4952432504248390a0a916a1253f928935ba2e87ea15
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 10736 bytes