Malicious PDF — malware analysis report

Static analysis result for SHA-256 024e39542ead0e7c…

MALICIOUS

PDF

99.1 KB Created: 2021-07-02 14:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5347fce38f2b1d463525146b6042ee6b SHA-1: 17c393d1909282a794ea15d3c3f7f87bc5c4bc91 SHA-256: 024e39542ead0e7c49d055bb62a9a90d461acaf689244811c16ef729d629d65c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://philabc.ru/uplcv?utm_term=the+thespian+meaning PDF link annotation
    • https://fablab808.com/nbloom/fckuploads/file/zupose.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a18643ab53---fodajekosowig.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/34130722141.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae00b136a---2890828893.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/getiguperawa.pdfIn PDF document text
    • https://hgb.se/filer/file/74704463291.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/mogowadajujegebixe.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/79231975314.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/fafupinom.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/deronexoz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5fbd96887---90086592791.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/99498076231.pdfIn PDF document text
    • http://huiking.cn/uploads/file/190234002934.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/rifugikof.pdfIn PDF document text
    • https://123natura.com/stockages/files/jurakigekamid.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/72359275677.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/28e00d7f94dbe389b0d3cd34ad8f9073/kigetabizuburumik.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/7avnhlr2te1d9tptcl2f2pk9vg/79747740883.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/13751751304.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/powopijekugu.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000160ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x160AD 18360 bytes
SHA-256: 0185d2ac674f82d20b14138693fb59c29912ac4c6a1acdff92a79c250ac71cae
font_00_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 23368 bytes
SHA-256: 844b1719444765cec6a49f6a9bd874ee2fbd3eebc3948577670da7f784b0fae1
font_02_sfnt_off00013be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE3 10396 bytes
SHA-256: 6595d2df02677028f735b74122fbb0265da987c63ced08a3d0a36c8edfed8ba0
font_03_sfnt_off00015333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15333 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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