Malicious PDF — malware analysis report

Static analysis result for SHA-256 24185ccf1f5878ae…

MALICIOUS

PDF

93.2 KB Created: 2021-06-25 15:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5e8697a602613bb764835cb1b3f5d86 SHA-1: ae9665cf6bc22e1fcb184292c44d17ccf28a39ff SHA-256: 24185ccf1f5878ae87e1af041362335c0ba532afbd17b2bd9f7259d43b261e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This suggests a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://hoakhanh.vn/uploads/image/files/80969605959.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/6dffcecb936b9c11d0ad1f9976dc044e/fajivexibavob.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0kr9n39gdrmf0pngaip4jvmtdk/17608491165.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444c817e0a---16278840850.pdf
    • https://htchninc.com/d/files/derekagej.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987701c4e41---lanaxolufopo.pdf
    • http://7166867.ru/ckfinder/userfiles/files/69001592916.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f521e94ed---wobajapekurobatapudelux.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d6dccc50---28646084565.pdf
    • http://firegallery.ru/img/upload/79671032459.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8c6e85eda7e4dc30a7553e50f5f9b0f3/92827992490.pdf
    • http://tms-operation.com/upload/files/kirezulu.pdf
    • https://hkbca.org/UploadFiles/file/20210601155620112.pdf
    • https://aneri12.cz/res/file/sexutiju.pdf
    • http://wu-pao.com/upfiles/editor/files/7136550915.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=from+euro+to+pln
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e897.bin
25f153bab7c6b441bf0af0828d3e3272340631574bb0ddf5121e9364682dc2c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 1764 bytes
font_01_sfnt_off0000f0ec.bin
7952f4b851b27884b5d2337725080fa6b3d33f901473938f4c0e7fb2600a20b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 18764 bytes
font_02_sfnt_off000120ab.bin
82cfadc8ec66b6df07633ae41e18f6a0a1e2d93187be687ae3a61bcfb9b1a8e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 16516 bytes
font_03_sfnt_off000137d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 16792 bytes
font_04_sfnt_off00014fea.bin
d0a042a43d5e703200430c5b53f9c60df3f6a0b3ae8ebce78ebaa716ba754ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 10068 bytes

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