Malicious PDF — malware analysis report

Static analysis result for SHA-256 3936c595664f1ece…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 04:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f433c8e5dbbcaf0293c21aad80a8463e SHA-1: 9fdd34e1a2a4995b09e81924cad756de65533ec2 SHA-256: 3936c595664f1ececdf2e0858ae87f8e4b2b320a31cb97ec096fd385240e2ed5
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, which is a common technique for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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
  • 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 http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/dewowuvitutiguworivuneji.pdf In PDF document text
    • https://sukhayurveda.in/userfiles/file/59878019575.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/19801617411.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/74d8055543199fdec548ddad688381f5/18131971318.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8rvs8nnv315e2ggjvjlkpsbsm4/dipumofabobidexiposen.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c5ed4303---rujamajudakuxojiwa.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/69856049564.pdfIn PDF document text
    • http://traviet36.com/upload/files/18094893443.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d5eb57fd8c54febe05a0cb0cd92220a0/fowefe.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/230675298.pdfIn PDF document text
    • http://vucert.vn/uploads/files/879067094.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2f9b50c8---92092347875.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/29477857300.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/votomoweterevopijima.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/40720697036.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/lefopexiwevijasozijej.pdfIn PDF document text
    • http://scro.ru/pic/file/24408758670.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/ed19d5d155d0285b00aa5deadf135a1c/tipojuwiva.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/vatelaw.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zaxigopafur.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3cc8582fb---tisizawuku.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/vuwoluboxiful.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/16c5c5a2569691621b90a8b8739bb73b/37025239178.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/damipofanase.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/16478196066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=queen+bees+and+wannabes+pdf+free+downloadPDF 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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 10688 bytes
SHA-256: 50a0008bf62d421270fbbc80387833020f326b3dfeda1a57a4c3fd9303ee4d4d
font_01_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 20344 bytes
SHA-256: 84a793bba0fe78a2bd9f2404e02d555330b7e18581d913921487be2a281f0a9e
font_02_sfnt_off00013c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1