Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f0bbc6f2f00a17…

MALICIOUS

PDF

80.8 KB Created: 2021-10-05 10:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01f7a8079eb74d525338c09b7afff98d SHA-1: dbb216597a6d199cc801906688bb7463c0192826 SHA-256: 27f0bbc6f2f00a177876691fd20f6cedec4588708c19ad1eec93dd39973f1dd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/da30d4d5fedced20df43abedf042eb32/pupefokasoravuz.pdf In PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/78225187585.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/37949286226.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/xifiva.pdfIn PDF document text
    • http://telecycling.org/files/file/wilif.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161528352d3466---gokejutavikoko.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/49669242137.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79983800298.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5d090974d---logarinoxizoz.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/65595514264.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/jamavodafawavikusibo.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/wofixugafexeda.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/lisagutaranotom.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/dixeniboxolagevixipo.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/dukepelobefesetasatek.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c38f6b7e7bd8cbfa8a69ddc0b0725fa6/jiwafosuxeja.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6265d28711b5afab0825f18b822efacd/veduxajomira.pdfIn PDF document text
    • https://granitnet.hu/editor_up/siginigofobivoda.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137923934cc2---jebotupuwore.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/50791159810.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210912154136.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/49339737930.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0312cbdc---duromu.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/puniguzezip.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/36385553921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+scramble+of+africa+answersPDF link annotation
    • 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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 10692 bytes
SHA-256: e20a6fa0bad89452a175d6b23d214e838f5575850d54f58fe3c1dbd4a01946be
font_02_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 19480 bytes
SHA-256: 25e997ae3a3b9135317099a315eaa6d9aa900834da4ea9f9770e0bda9229cbbe

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