Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b07bebe484e03dc…

MALICIOUS

PDF

88.9 KB Created: 2021-07-15 15:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9af25753af1652ee810f96d598dd2be0 SHA-1: 3b7ecf4c85462d8e33fdaf9775e9517238bd5e9b SHA-256: 8b07bebe484e03dcf08dff646143269358425e6956553a8fbfe8c39571165470
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • 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
  • 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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bhumkqjmoimu2qtr0j4pao1kuk/titijorerenet.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9pg3qbci33beb1tp38sv0kjdn2/82182262943.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zeladizasux.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fenajozogavimiranoliti.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/bozulexufugu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082434f8751c---duwawufumikoxefimojewodu.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/74995935745.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b92a5d2b---15999436019.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/omkioedqcgpcha4ailma8ble84/juwivit.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/kezonovinazadijupara.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cd5225fd13258e34a11bfee51ecfce1f/51932022078.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/74152806489.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf5c2951ce4e653e36f5ada8d3674104/52990699649.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h3jnecvl0jm28nkc38ho258bek/mimawivetemefideripesodup.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/telekuxosozumoz.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b0d7e2a36690d630b53695eb7d76667d/xudar.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/355cf2d74dbaae267463be1b5487f611/67623457120.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/38435086817.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210704_092443.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bd9889a765ec634a132fafc4d9202346/fawulitugebo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16680b494d---solunalezopekazig.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/wafodixofuzam.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/jopoloral.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/29478ae24a3748ab9da5c201298ea82c/dafelefam.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608456859ba23---25684289309.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2525e042---panajomimuwelakikimokig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+adobe+indesign+open+pdf+filesPDF 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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 19656 bytes
SHA-256: ab1fdd5c3b1a63723038354ae6415d9a8582b2a7c4a232797bd860cc8dca6190
font_01_sfnt_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 10644 bytes
SHA-256: a8efeb9d4c54e416a92fd0a4fdd7f6acb70e82b55aaf8e1bc82e0515a9c3df56
font_02_sfnt_off00013e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1