Malicious PDF — malware analysis report

Static analysis result for SHA-256 4859c48740ff1a6e…

MALICIOUS

PDF

99.7 KB Created: 2021-07-13 23:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cadad4553256de3509c05c77705ba32f SHA-1: ff955680c7a06e782171c4060b6b7e391e80908b SHA-256: 4859c48740ff1a6ec498f6ee3c8023c55fadb3733429ceea1cce9451d98d7379
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. It also features a large number of external URIs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://queure.ru/uplcv?utm_term=transport+phenomena+fundamentals+plawsky+solutions PDF link annotation
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rufu6hpg098k8sitkujk1i0618/22478015512.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/12cff98e7e60861b9d840eb108dcd208/59330619204.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160805898bfb47---sizerawinetufipalosemuvin.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/ruruvirarexogo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16088ada1e1b33---lidirarekinowukabanuxapu.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/kaseduxowaluluviz.pdfIn PDF document text
    • http://jngf.cn/files/file/memamujapazufalakabug.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/musomividefubafin.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779a4932e34---luzusavebotoduno.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d8a5d4b95b90b82673067b781b4d6ce/18273751283.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b90c3831f73---bapipaxogofamumoje.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/88477920124.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/78499647767.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd23489b34c---dazulagukasag.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/joxipuvebufoduzasofubedo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc47d652d---lifisozinas.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/mesixezorir.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac81b45f3---34234977844.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/moluwokud.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/n272qk76fjdl0qscrr0kg8vari/xemibazoxon.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/52750746500.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/21581045765.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160876948464d4---tuwonanaremadupixe.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/8ntt53b6bad30lvc08di86hr9s/jaxoxe.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a316ba25634e32aa10938dd013eea205/99332264375.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/wiluro.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061811551170554.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f132.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF132 25796 bytes
SHA-256: 26262e8b5c21991940900ec94bd0d1eb6c3d26482e79edf4ce71a1c34e1c48bb
font_01_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 11116 bytes
SHA-256: c7a4248d9db4ef0f7002833f0e0102ac500fdbf1adcbdb85b0701fbd91c991a9
font_03_sfnt_off0001519a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519A 17824 bytes
SHA-256: 6a34ade5e606b79b56e63bde00f8bb24c680d192fceb91528b5b619b1bda2192

Open this report in the interactive analyzer, or submit your own file for analysis.