Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc5c7e3daf2efc6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 07:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d82372469357fec3a6020b6c2cc23f3 SHA-1: d940d1646dea88412ef9f790e178ffbc14b63548 SHA-256: adc5c7e3daf2efc68bb56f9f22056649209db081be31b4ecdf577187e8ef5c19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, pointing to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://yer-krasnodar.ru/ckfinder/userfiles/files/vevelojajon.pdf In PDF document text
    • http://ajitcoatings.com/uploads/97436563929.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/49143013603.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c27d0752f---39835988340.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada4bc1a00---20532374628.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/30313703847.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/zevip.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/9346130933.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7d2d5401f8d8c8a28f1840fcdf7446fb/79301723917.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/25125163160.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210912105809.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/47282620609.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5931f519f3ded495f03e8880aa880ee4/18759790550.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/56166231693.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/39882387448.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/mogagi.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/86367049865.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109091354278408.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/jasorujujoregex.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/deforitajojoje.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/53349886025.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/54208769647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+app+to+watch+live+football+on+firestickPDF 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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 11016 bytes
SHA-256: e89765be1e42e26baae8dc4cae60b00b2f4a1014d6e1954dd6c89dc0eb9315d0
font_02_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 17472 bytes
SHA-256: 792a819f743342afb3143d93a90e07ad6ce48b9a8bdad66e64e9143fd19a82ab

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