Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55b002a5d03e38f…

MALICIOUS

PDF

82.1 KB Created: 2021-07-16 23:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5c10392143295a225999b6e0e122da87 SHA-1: 15d987bb66d7be435fb5a529577f0c83c2e886f7 SHA-256: c55b002a5d03e38f1e4e25a9d21d2c3610f7c8534ef16f3fca5b8f1d2f4df4de
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or malicious content delivery mechanism. It contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the ultimate destination or leverage trusted infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stmarys-perthamboy.com/upload/File/91710671595.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160edc48b92942---90420095846.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/liesklq7m6q7ih88gnadi0dion/46640560530.pdfIn PDF document text
    • https://ksuskalology.com/images/file/jixiged.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/61b261cffdb03631ffc8a167e6a84d71.pdfIn PDF document text
    • http://metallpress.info/files/xosepiregeforetusudogur.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084505176729---selisigofuge.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f9733e2fef18f747a32f08f736e460dc/folofebog.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mphifisllu7laurh5dvq0f53ij/zopisepifiruk.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zewebexikedivoz.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea82ae704---zivezaxemavewed.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210611_1A35211B34AE28F5.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b513dff5a---pujikoxonudinugepabobas.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713662a30d0---34100595017.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/97557715591.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/87695992609.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60bd5d50c9074.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/69956011794.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6a7c7948---sijege.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/rimuronalofove.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/gmor2gjk3h7l1pi3uqiu112617/37195846463.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tigukenanoduzasupona.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/41119575638.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/wofivogubotojajexaxir.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7eeb37107b4t6ov3cpbt1gt712/xesitizopelagilaboboreb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fur+elise+easy+piano+chordsPDF 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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 10704 bytes
SHA-256: eafc5abaec1631f5430ea510c1278a69c994ff800016b6d5ffd7d25ed0ebede3
font_02_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 20352 bytes
SHA-256: c2bd390cb58019c3a2c737b0644e00d28658d24717563836a781eec822384dc6