Malicious PDF — malware analysis report

Static analysis result for SHA-256 f449002c2d5d2628…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 02:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: afe401e3c421af2bcb2f0fa978c0b692 SHA-1: a8e5e019f188c5703f058a25ad6132483460e892 SHA-256: f449002c2d5d2628082611476490f45ba7fa9738bb3bd3abb7723febf4bebac2
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://chcial.ru/uplcv?utm_term=10th+ssc+geometry+book+pdf PDF link annotation
    • https://ms1oke.com/contents/files/figilewatulasisezibuwarop.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/fisolanedilabugexozerudiz.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dfac73156e6---guvekidakevonafixekof.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/918d3266ac22de8d2e188411e3b0cbc0/bodadolo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/05ipr21q1tpob1j8veaemos8v0/teduvijaxo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k8qrukurtd2sm8bt9kndlvi5t4/mobawajumiwadufupurutopop.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/xuvixa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/8439803377.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1745d24c0e1080590f427070a29fe32c/nalabupikifugerepelulifu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1f2812cc7---jamiwobovud.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610dcdae893ba---57444459885.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/170748babe2d30b30bb9921677cd96bb/39518915802.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/98gflnmg01qknr9clpvsum9tod/99131097945.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/zavipur.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/54642764605.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ded8c1a1e26---kuvaxerulabezataxamebegal.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/2228502904.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/vojun.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/satavadunapizu.pdfIn PDF document text
    • http://mqskin.com/luutru/files/91564409901.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9209738af6---varofudupujeripedawu.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/finojimibotoxinopudixu.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/37548643199.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cb93202d---18234559773.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/37497752657.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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 11084 bytes
SHA-256: 6c10fd11f4a617ebda1158ef1e490d48dcde15f762f15a61496ae8584750197f
font_01_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 21416 bytes
SHA-256: 89e1d358630122801b6029c1877aa00b22a4eab60d51d25892153bbd6d396672

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