Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f8675d5d9c5498…

MALICIOUS

PDF

116.7 KB Created: 2021-07-30 02:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72df94ea022d4cf95784b6842aecc7d1 SHA-1: d52b94582e61e3549b775d9feb068d6065bed85d SHA-256: 26f8675d5d9c54986815ba3b2ec3d3984c4af55b01ad18f58b7de804c0367993
164 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b489e9c9c---29398822287.pdf In PDF document text
    • https://kumsalgame.com/calisma2/files/uploads/tamanamide.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a49b90a2a---81770304557.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b2bc3763---95412924756.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/loxik.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbd83cbe4---72975558282.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/81869752384.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/debedumugepimibe.pdfIn PDF document text
    • https://longhoang.vn/upload/files/bugikigovojamibiwis.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/93903480336.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fd3606bc---29491305663.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/f36bukqv02c58iqbtoo8ilgelc/diwubojadebolaloxugixukaf.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/luxuborevure.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/9592564813.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/68662914604.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/vuxejibulusinoli.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/beletifov.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/37967847904.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/60avgsao3bpbeshvdh7p56b044/ruxevabugatoxefofegunat.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/50c9720e18bdfd7c4db9c7b919461fb4/10694350680.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc5c794ce---59475395392.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/nulofuf.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160855409a3e14---fuzef.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf016bfda---58292528303.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/92032826079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cooking+merit+badge+worksheet+answers+2019PDF 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_off00016268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16268 11460 bytes
SHA-256: 5a8c4efec1d33681c744b6c30105bc3c5638c063536bdeb69818b49d46e2aa4e
font_01_sfnt_off00017d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D45 17424 bytes
SHA-256: e4a5e022a01e8296db807c768cfb22a47f6daf95d5130af1753c9ae8dc1f628a
font_02_sfnt_off0001ab27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1