Malicious PDF — malware analysis report

Static analysis result for SHA-256 9954008010fbfcec…

MALICIOUS

PDF

85.5 KB Created: 2021-08-12 19:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef71c3cbdc250edfe70313c7c97f3772 SHA-1: 525f5b22b55ee923104e8af750270c26250880a4 SHA-256: 9954008010fbfcecbc7dbc6078775cd183763b76387995edaba67651c3abc1ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to distribute malicious content or engage in SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=algebra+2+final+exam+answer+key+2019 PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0b458299---99231558841.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/62086115927.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/70532201121.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e320f426846---rurerojige.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/10220541924.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785aeb442a4---gaxawomekixosudalili.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e380cce782bec642148551d052f8a5b5/70109992314.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/ribobones.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/zeraluferalof.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/sojuko.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/gesevufetuni.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be50d606544---kavolewitosone.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/polefid.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27c27baa9f---xegalobu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1621783465555287149.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/34838839635.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc87a0691a---15544515640.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/marunuxajugawabapa.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/ratokozonojetewomepe.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/299dfe8f9178790cd4b07298403af488/buganepomoded.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/fobarisume.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa824e6c0fb---wemedoliporifaguko.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/dikigeboxageto.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/xaxom.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/lepusibekomudelus.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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 17056 bytes
SHA-256: 820dff64987c7d9e8ed1a5cbbcbe7096697a189c421c734adff3feaae730940a
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 11316 bytes
SHA-256: 4bc7403fa6ea71602010c6283189bd0cb0b931ade9b48d1146b8f912fdce20d8
font_02_sfnt_off00012ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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