Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe5f8414b73970c…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 01:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad2d1b4e2ca8f80fe25b797beb790f84 SHA-1: 0c493a1c887e7b05750151aef1cf146995031927 SHA-256: afe5f8414b73970cce6091d31a07c38a8fb7dd2c418807b0e29ed3d8ae620be6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being detected as a phishing trojan. The presence of numerous external links on potentially disposable or compromised hosting supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://j1medical.com/uploaded/file/famuwijuzatipotodejomorur.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160799ea270e47---guwavemoxotidinapilirok.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cvmfe35l688366jd32bc943v2f/zizarojifutogopakuridi.pdfIn PDF document text
    • http://yulintimber.cn/d/files/menodivigo.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/xujalakino.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/nigupudolifimi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f073cfa9f3b5006edccea8c0c853adca/73833127926.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/tovopateg.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/22048274932.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/sadosadepuladojakijono.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/vegojebuzixukore.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/39043670600.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa861a96fe---kedabim.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/rakatukusirinewidiju.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608317543de26---39590161446.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/33046781045.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/7029674057.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e4bd394d---88778845112.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/86210634425.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210623074339_flasox.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/dekuzubepikuriku.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a7f27d08---78312893505.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fb550279f8b0ff78a741592db396dd47/dulukuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=exponents+and+radicals+worksheet+grade+10PDF 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_off0000bc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC96 16972 bytes
SHA-256: 075e924d324377a61dddb376c372ce1047000f37801d2a7b0f9cccf5e486b1e4
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 11232 bytes
SHA-256: 72411472229cfcb636b76734c783f71f94edf3523c66879ce0d191d6e7de97a0
font_02_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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