Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa75caafa696fcbe…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 01:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58b3dad1e7f638843f8d77a92e8c05b9 SHA-1: 3903ffcf706d27976804b4e29ab6e1d70576cf42 SHA-256: fa75caafa696fcbe3022e6e955ef41318d978aa6555738c3e64da7ace3ed8af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised WordPress uploads. The embedded URLs and the overall structure suggest an attempt to lure users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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=physiotherapy+stretching+exercises
    • http://asijskepotraviny.cz/files/file/41208807716.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/nereretovi.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf2ba7a33---gerilavezonabir.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/45ca662f1cf44182be96c2dd18496a20/lexiditowuxiwo.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b788e5132c1---67751052324.pdf
    • http://domeinbeverdonk.be/assets/files/file/nezaxovesegit.pdf
    • https://medius.sk/userfiles/file/77973644432.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf8d420a12c07fe2019f1048267bc86b/11648681253.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9737c6c65---wefegovamugewivovotepok.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a3dba3ac3e0bd0012053f7853568c55f/58118665278.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c879c9eb1f5---kajaroravivedowisitosoliv.pdf
    • http://capitaloffice.pl/fotki/file/telavu.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/39330743235.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bc4d117f---10383947483.pdf
    • http://soles2walk.cz/data/file/godenimasotivafez.pdf
    • https://ev-owners.jp/userfiles//files/makogodegigegopewekusu.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607815d545626---lovujumik.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7375dd51f---liwotepewupamixawikig.pdf
    • http://chineseclothingonline.net/File/midilivalap.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/de8f8ca399522914ccf3742e9732f3c4/kevevexirefipixaluwumuva.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b8c51a4ea3e412828392a4431d2e8254/kogamefesedatuwemomezobe.pdf
    • http://capmar.eu/userfiles/file/taxoxuvodi.pdf
    • https://menlopark.com/wysiwygfiles/file/lojegisufekem.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bde7882c59cff73ed6a5f7018f4ee726/zunujob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e0.bin
80435891544200df89d0bd8c3515bb77ef02bd9439189360ac3f5eb6e6cda1b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 17092 bytes
font_01_sfnt_off0001228e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16792 bytes
font_02_sfnt_off00013aa5.bin
f749a7be9970a522bdd77cf8d00c18b40b850b048889a633f01d143df2be47a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 10824 bytes