Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7cdfe81e10e767…

MALICIOUS

PDF

99.3 KB Created: 2021-06-30 17:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c8bf2961d0467c5092886916b25e8bb8 SHA-1: 093620a300e35a3a1536ad0a45cf6845b49cc260 SHA-256: 1c7cdfe81e10e76703a566e101932e3251d7e41ca23efbb9358822c12e561e84
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://thegioibaobicarton.com/Images_upload/files/35857593980.pdf In PDF document text
    • http://naplesredeals.com/userfiles/files/fazopafamerenusetet.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b4cd42204---joxodizumi.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef593606c---punazop.pdfIn PDF document text
    • https://daismene.it/file/7991287121.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/50240043418.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0vv6hc9r46ah18656nm1rno3gf/86296936100.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/71903398655.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/fuvugopetuvepilupe.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8243a49fb---26627658023.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0h0a8lc6ajgtf3esi5n6m7hgl4/sodarul.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/78459302617.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/giwiralo.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/56555615641.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/zabibonuwibaniwowodakibu.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/74658309952.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2d89b70981873b8e1bc02ea83914b2f3/47773277232.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/56666281852.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/l0t7sogkbofeh0kg3lrrsdop05/laxinew.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/gijebusewabex.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea6145f314---12799111819.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/kipifulipanupereze.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba37f4e32ac---50392098654.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/5197959556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=separate+mail+merge+into+separate+documentsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 18012 bytes
SHA-256: 715bbc7e91428aed671f8e243c1877eae5fa4b6daa70b513c7bcbc61b09deed4
font_01_sfnt_off00013892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13892 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_02_sfnt_off00014db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000165c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C9 11032 bytes
SHA-256: c5f0641923386f03368adeeafc71513d6d38c98500a05efc645a35a9fa708567

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