Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa70487b914ac77b…

MALICIOUS

PDF

112.3 KB Created: 2021-08-09 09:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 84882e1de99e055838425a3493de8c7c SHA-1: e7ea07b8fac15123abc798155c26bc587c257d58 SHA-256: fa70487b914ac77b21a0954efa4026496ff43cb413964e68bb3d9918db289bfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=descargar+juegos+para+ppsspp+gold+gratis PDF link annotation
    • https://octvads.site/js/ckfinder/userfiles/files/10361100900.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077279c98df7---24382090213.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4k93ic8ft9c6ilm0gk6a55snj5/liliwugufifexeronoj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9a5e7b65dc49248ce40898852f2b7d8a/63595824956.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2bdedcd3b---woreligivoxuwiz.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/xerikojesowilofumonuzu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0074e0c7788f41254bafd10dbda8783d/26711251970.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/13q1s5or81fe5l92sd8clme8j9/zerowonejeneviw.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e51dc023f---sibezovaxubawisuga.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/jogadidabudofumaxise.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/dojinojalixiluxiwijenumil.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zexatowax.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6e279ef19---17124509815.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092fbf5802f8---96414481317.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/nuposuraxekefodoxofuviz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160861ffa05292---linumatetewupejamaf.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/8164061579.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608421e12c74f---21624749969.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87311889776.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/82858527891.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086d424089d7---solofoxewajupupevesusa.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/vifisirivakomogufur.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e10b0f32916b48fbdbc4d9a4813e8e6a/babemovanuzuvadero.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f84718c7ed---50316246232.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ebb20941d1066c2857cfbf586a871894/zubiwasowibuj.pdfIn PDF document text
    • http://minerva-collection.net/files/files/81831372759.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_off00015038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15038 10816 bytes
SHA-256: 37937917503b117a5bca53cab99df69678e7311a50b1db3385e9c582accb067e
font_01_sfnt_off00016917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16917 18660 bytes
SHA-256: ccec32545eef64ebd2c8769477c753e7928a14439e51bb371a38113ffed36d47
font_02_sfnt_off00019863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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