Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af7aa816979cf52…

MALICIOUS

PDF

134.6 KB Created: 2021-09-05 05:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89ae73a509acbd9c3b945ad5f64ed95c SHA-1: 0ca67286f2afb38082b7dd74c958d77918544ec4 SHA-256: 7af7aa816979cf52b3d80d36a063f9da78f31222a33feeebabfc8e3f35c337c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Heuristics indicate it's part of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://taperagi.com/contents/files/vomos.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jo2clalioolro126ltkdre5t08/82900093655.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2687738aa---puwexisekavukoni.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/majidijejitugebu.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/80254499195.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210615_012659.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33eed5da8d---bokajuweke.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bf1c1273a---65085245604.pdfIn PDF document text
    • http://langmypham.com/luutru/files/monerojomomo.pdfIn PDF document text
    • http://4darchitecture.org/img/all/45524853758.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/valumoretuzozogu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/8khd882hii9fgd95beivrd8r21/fobogepidakijufag.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/kakobivodajado.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/mogovobediveferatazera.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/15404119194.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2570f60e5f---28433562634.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/nusubuxaxuvuputenejite.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78780bc20---29630766268.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e801f238---rosidasunagizupezime.pdfIn PDF document text
    • https://limsurempat.com/contents//files/nukusilomuzipefexesefesa.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210828140845.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/29430600f24ba0bd9848732ec9461862/73078017718.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8acb307874---1062427526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+sigmund+freud+psychoanalysisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F5 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_01_sfnt_off00019c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4A2 24096 bytes
SHA-256: 527c7f77d91443542e1e0031a15a0ecb8cf6fc82d1dac1caf0b7cdecd47acc98
font_03_sfnt_off0001f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F26D 11184 bytes
SHA-256: 8281c03639b183b739e6da08c2deab00781f27b2966399fd3f9385971de5a626

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