Malicious PDF — malware analysis report

Static analysis result for SHA-256 955285bda6f60dcc…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 18:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0ef860c4791bbb794965f84bdc9ad56 SHA-1: 28fe0b47b0558feedc09f45bfc9b201ac782d2cd SHA-256: 955285bda6f60dcc8d009b3d97b1a6a5b7527b8a6d2c165385917966ddced146
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=ea+cricket+2007+apk PDF link annotation
    • http://baltyk.recykling-rejs.pl/imgturysta/files/79202683818.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/88632979040.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/35156011269.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/78296867990.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/jolawerud.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/84204710413.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/5527638361.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/26611912585.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1118e7f40---22646312769.pdfIn PDF document text
    • http://bndweb.nl/upload/files/bikezelelefawasilepubo.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/ninetutopesupexofifimoxe.pdfIn PDF document text
    • https://bfull.ru/uploads/files/55396966976.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131335c47c1c---dugezusafesud.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/9454456322.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/fosigixapekowakebunegoz.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda04b7932---japerefokinidezisamum.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132680fb917d---wafurerafataw.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/31189269363.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/duvizisusijenux.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/52706619447.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rejuzovapijivesatosub.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/sejizorazisedeseduwopax.pdfIn PDF document text
    • 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_off0000e539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 17788 bytes
SHA-256: 4f4298638f9054a0a3fe350580f4b4a02fb170a1dbe8f5c7dd70fc890eb9e8f9
font_02_sfnt_off00012b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 10296 bytes
SHA-256: 44d7b6f28ce3b8ed8a7e8580f1a0639d7fb8ef79f39e0e980ac3996c5e9f8f31

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