Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d89d013ef1a6544…

MALICIOUS

PDF

179.3 KB Created: 2021-06-28 21:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1c76458de23d6f2b6e436894da283d0 SHA-1: e62a4e4357adba995768070e381e1e3ce4d885b3 SHA-256: 5d89d013ef1a65445f94c90f0d2e5ec563317992035fa38a17d1b147ea323971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01d33094c---xuxidasivunanu.pdf
    • https://weeb.nu/userfiles/file/66710737927.pdf
    • http://premium-t.info/files/files/wubexododusulosuzogovonab.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13755db2e---32157696648.pdf
    • http://luluscafeonline.com/uploads/files/51391660546.pdf
    • http://homelife-superstars.com/image/files/xitafexagerakiwawap.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f4617aaff---binuwusenulofezikof.pdf
    • http://klubalfa.org/img/userfiles/file/18153099009.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/cda39ba4d89642bdaa9631a2278990a5/nitabijikutatupute.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609130bcb32b8---duzamoneje.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/lamapesofagepovat.pdf
    • https://pezenasenchantee.fr/userfiles/file/fililavopa.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/88802561740.pdf
    • http://jrpst.pl/userfiles/file/38966954720.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768cbac76c3---71185171264.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd08d86b5---33771866691.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1346c917---23477229144.pdf
    • http://alrehabourhome.com/userfiles/files/21967595342.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec8ea857c---ribukemisurod.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a03d0b454---534198352.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a253ae6e970---43409969440.pdf
    • http://wojno-stal.pl/pliki/file/lumetosaxe.pdf
    • http://sam-global.info/files/file/88661238019.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070452c47402---49496554325.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e38efcac6f3e6bfda217208cf356b447/fimezidixozekigu.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c60db6b160f---nawidewupugufidul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=stories+of+a+thousand+and+one+nights
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00026077.bin
66eccbea4017bc855ff6fa42eee2bd2f1427cefb959d7ba1b72302b4432ebaed
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26077 25504 bytes
font_00_sfnt_off00022b24.bin
87e12f7a2fe72d0bb7581b1c6b056d60ef98e18b8f103d8c0b22ba2da3295662
pdf-font-stream PDF embedded font (sfnt) at offset 0x22B24 22340 bytes
font_02_sfnt_off00028e5a.bin
97d935cfaa0a71e93e9867adb37cf90a36180c6e2cbc74a09f7bd95f4ca01136
pdf-font-stream PDF embedded font (sfnt) at offset 0x28E5A 10764 bytes
font_03_sfnt_off0002a6d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A6D5 16792 bytes