Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcf8e62b7f2c8d9…

MALICIOUS

PDF

99.9 KB Created: 2021-09-04 02:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: d06769fcc271b4d71580652707aee79c SHA-1: 898ffc44fafce570a8c56d5494490be3bb4f0a13 SHA-256: 0bcf8e62b7f2c8d9c890f7bb84df21fe33b84404cc97e4032d89daf7a10e8cf5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojan payload. The embedded JavaScript likely facilitates the download and execution of a malicious second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier clean score 0.2141

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://drafthe.ru/uplcv?utm_term=autocad+interview+questions+in+civil+engineering+pdf+download PDF link annotation
    • https://llsindia.in/FCKeditor/file/tebal.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/nijotedesafetabilaf.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/92593342699.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/60588153216.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/zolujatemisexisekimawup.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f97f6ea90---70558517140.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/falasuman.pdfIn PDF document text
    • https://tonitomov.com/picture/file/vomepug.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/52236316977.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160858b9599980---mofufotawajinijopokakidiv.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4fh93f23r7sfqiflenp4at81q1/45633175066.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/9370734023.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/4adb9d2bf12ec0517dc4049112dc3c03/bulikiludunefenavagetigi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7th7g473er9o3rjco63p7vp9g4/80979277879.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9d18af90---22988701764.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/8582079580.pdfIn PDF document text
    • http://ausafe.net/images/art/files/49437409852.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c45c5c6dcc---zimawosepap.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf27d01a4---kabitiludowubetorepibifed.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/78203399498.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/tovokademalejonagibavaw.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/zewakosisedulubeti.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/nudutopavalobegipox.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/38750420147.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/babigoditegoximipakapataf.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001546f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546F 19684 bytes
SHA-256: 96e75189b88fafaf869ca2c4a0c56037a8237885d2e439c0e6df6f51328f808e

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