Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbec361e930da285…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 13:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62401156c307cf794a896604d421d1db SHA-1: a35810e20a4fe6582b63aa0602632a1637f7b592 SHA-256: cbec361e930da285f0927b8bdc994a527aa6569210ce655240affebb03c9ff51
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious commands. Several URLs were extracted, some pointing to potentially compromised CMS upload directories, suggesting a download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://swagath.co/new/ckfinder/userfiles/files/70957838037.pdf In PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/vemapibuja.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a63b199234b2071b22f26d3730b8a944/zaseradodig.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rovisutes.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/wozuvopajijazazugobowa.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/revoxekaw.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/gedewitebofazo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134352d2c4b7---55048586127.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/mubozujibu.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/3469331829.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/3192638286.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2m907j07hbv7q1v3p2hn7font3/fuxifibosopesiwu.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/kefunu.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/47073265587.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/41728601377.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/56317855573.pdfIn PDF document text
    • http://asqcert.net/files/files/94505722205.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139566b20747---59015944830.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b78ba0ef4fed9578e89c5ff79c6b10ce/rixife.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210904120036.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a8063231---reronirimidipolozojuwej.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/41131678368.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/tixupuvivumuvumututovu.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/bunafevekufiwufi.pdfIn PDF document text
    • https://tl-systems.hu/files/files/26809465187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chrome+os+dual+boot+ubuntuPDF 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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 10692 bytes
SHA-256: 040645bd8bf35fbb4bcd47c2127c022c369e98a76040e2d7130893b752684437
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 17420 bytes
SHA-256: eaac09def8bd5261eec6d348d504dd2a5b31e694454781986ab2503ebef4d7a4
font_02_sfnt_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1