Malicious PDF — malware analysis report

Static analysis result for SHA-256 143767551173df67…

MALICIOUS

PDF

69.8 KB Created: 2021-09-10 20:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce81f5b5dccbb698e680a9e143665518 SHA-1: 36d56bede6e1bc65c15c5f51cfa875c9a0512828 SHA-256: 143767551173df67e0f28296c41cf580e3a92df887d696b87622cb47b2a45764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.sudoku-cool.com/ckfinder/userfiles/files/gipirelirirug.pdf In PDF document text
    • https://riwg.in/userfiles/file/tibaxalolubajikarew.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5208caac9a21136cb8a9a1c2167ebee0/febuvaxitamam.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/9229381600.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sudewunonitukob.pdfIn PDF document text
    • http://parfumland.sk/upl/91015096224.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/57078480405.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/maripaguterevizotudez.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/likulisuwexawegeraduzoxi.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/62421036178.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/pivapanexuri.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/89461769194.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/wugimimaxafololagu.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/lijifubaj.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/juzobopoxixamizalito.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133989101aba---45649266041.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/17da70ee9383ca4b2ad223cd30e4aed3/posewuwefanumodumoruxom.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ba2b29275f4452cc142fa1c13c771027/kivatefesog.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9d66429a5fc90e7125529a4e8e4309a3/86524823154.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318d838c87a---lanubixo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/m32k0el4v8e8cpi40ksfmf40dh/57508643000.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/22992592183.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f4957c33e37c1c8351a083ddb6a7881f/84226848430.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/82600389722.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/20156987172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gallery+plus+apkPDF 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_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 10176 bytes
SHA-256: 646582f286640f3e7b110925cf37578e8c170690434dce0bc9aad70631af039c
font_01_sfnt_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 15560 bytes
SHA-256: 2671c43508808968314f6ee6d71c6042774139596a232051055dee72e03f98f0