Malicious PDF — malware analysis report

Static analysis result for SHA-256 1303da93b0ff8c3a…

MALICIOUS

PDF

90.7 KB Created: 2021-09-07 01:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 10cfe1f500e7d2eb7f05c87c075738e9 SHA-1: 16c2f3e44ad96a453274111d26af707aa1727a4d SHA-256: 1303da93b0ff8c3a077c3c259a3eba6f54c912beaa0b69477ad50798ee785b73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to malicious external content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://coretry.ru/uplcv?utm_term=dessin+menuiserie+bois+pdf PDF link annotation
    • http://reichspfarrer.sk/file/mizoxagawobefiderufa.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/50932845969.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/zukoseborasetes.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/998665719f14717b02506d077747e730/55711816951.pdfIn PDF document text
    • http://aa-nusd.jp/wevex.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/filojugosoderulib.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/21378573985.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/14894088805.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c216842081e---nipowirezugefejug.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d73273a3c673869aee297ccbf000bff8/danidekeguv.pdfIn PDF document text
    • https://vestol.bg/files/file/jugove.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6g6dk1m2r3mo5ou1ch5scp95r7/fusudazut.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c5c8cd8378---dejasagoduzam.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083339dd38cf---benukamosetowafin.pdfIn PDF document text
    • http://vinmexindia.com/uploads/muxajekoxaf.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5a74b7775a95f74a29d79abd20565434/wigebigopel.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/91441478169.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a20k53otgig4686bmrd31fdsds/90245314507.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/7083723463.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/dudemiresof.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/50706824243.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa781d6bf4---kofikezexuf.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/19/file/20210819_063017_130.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/memujanejenudumab.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c4a6aa2133330dbcaa15075c1dfee0a5/32002659579.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/19929298408.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/kujitafapepujitifovaduku.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 10592 bytes
SHA-256: 81a805e5bce3cdbf334465479b27386aa319d621ab69ae44d710444b185c6b75
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 19832 bytes
SHA-256: 604037715ed64645367f231d31b3ddad1628acb1a9adae3c16ce70bcbf405d0d
font_02_sfnt_off000144df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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