Malicious PDF — malware analysis report

Static analysis result for SHA-256 88afa49d8ad3c16a…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 23:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 806bb5e0a4ef5d0cf84ad4d7c6facbb9 SHA-1: 4ba065ca62defbb3d7bd16af348899fb4052dac7 SHA-256: 88afa49d8ad3c16a447c1300aa24a2e7e4abd5e50b5788a89fcbae5e0e68bfcc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute phishing content or further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://otoozevran.com/resimler/files/nusisejagoliweted.pdf
    • https://abugfreemind.com/userfiles/file/5262845872.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dm29avslu6j26ust3iej38m6kt/kananedugekofawajevep.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/30eebebcaaa93d557f34e9dcef85f19e/zobowini.pdf
    • http://kulturazebrak.cz/userfiles/15025314687.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/d63cma17i3330bhlddo5ui1gt2/34125696680.pdf
    • http://chixue.com/uploadfile/file/20210517020630.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jitasedazofasusavoro.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femiribepavidikeguligepob.pdf
    • https://hr-serdahel.hu/images/file/99369318304.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/arh14lo9l8eee64fdjjitfjj9h/kegaw.pdf
    • https://arrayamed.com/userfiles/file/kilexumenonagafol.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e7112690---tamokofifixalazulesokamew.pdf
    • http://yokohama-model.com/userfiles/files/rojozesolujepegiliwidabo.pdf
    • http://didopack.com/files/tabunokijowekuvaso.pdf
    • https://hogozaty.com/ckfinder/userfiles/files/zikiderotirid.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3233063dc9---lamuzofinenurizewiru.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/goxiduvovinusemuxikagagi.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708c8ce0aec---24407630556.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nidutidukunexumipudapute.pdf
    • http://netmutum.com/userfiles/file/vipenewopamem.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d8d51aa5---ridifokujaporu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=share+market+timing
    • 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_off0000eb44.bin
24edf5efbc8ac1e50dee55993b4ad1952f3a0fd6d72d3a308ec6cf30d35fecf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 10388 bytes
font_01_sfnt_off0001029b.bin
0e469fa2e82ba561e88054d32954f724fa1f72d493bd5fd0adea0bd4bef7d933
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 17852 bytes
font_02_sfnt_off000130f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 16792 bytes