Malicious PDF — malware analysis report

Static analysis result for SHA-256 097574fa541e7331…

MALICIOUS

PDF

92.7 KB Created: 2021-09-06 04:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4893cf98ed984442abb424e4272b99f SHA-1: de3cc3471c34ad016e1a2363f73660038e0beb4a SHA-256: 097574fa541e7331d6d2ca1fea0fc6496103714fdc2121ab99442a36dec7aa37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, numerous URLs were extracted, many of which point to compromised WordPress sites and are part of a link farm, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d451e2818---lapuzojasijojekapate.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03852d602---wivarofexugosurozip.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/nerumigarokamutona.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/fefozeg.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4ottsn6dtmc618cjd3a9ua7vgr/matamuroruruxuxad.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/desedaxerixa.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-25/20210825040416309919.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2b57d4d7---xikizimejowese.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33029a1201---nebuzowegofimasugemozaxa.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/bapuxizeroketidabajipazot.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/dasexuxegedoset.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b76606340fd4451c79083eb8e69f1c90/rejabagidanumajilej.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/3443496121.pdfIn PDF document text
    • https://taperagi.com/contents/files/43935224413.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e21e06bb7---33307253503.pdfIn PDF document text
    • http://vce34.ru/attachments/file/demikorobutog.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/5f91c463ff099794593c8f7627caaa69/wikoterukabapesef.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ee79a83c---kajenomanagomamubizotil.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/bomatuwupekuvexuf.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3908494094---duvejojinibobepevalasaka.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/28193950256.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/voxozeligerebuzozeno.pdfIn PDF document text
    • https://airxps.com/userfiles/files/81815832381.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083449d4569a---24317097204.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823c83b8a95---varurizexug.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/58098544093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adding+fractions+differentiated+worksheet+tesPDF 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_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 10868 bytes
SHA-256: 0366c0f1547a79a8edc34ea6d9cd961f97e4c6c8715bab72835084376a2c27c6
font_01_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 18364 bytes
SHA-256: 318b63ec3b284917e83577eb9766bc239aaf9de76f55e0f2944b84c026bb8960
font_02_sfnt_off00014c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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