Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0a53d58053b5fb…

MALICIOUS

PDF

104.7 KB Created: 2021-09-02 06:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abccbea292312f8397b4dd7d619629d8 SHA-1: f630e246138a6bb51d73ec4968c39de4c71e98e9 SHA-256: 8b0a53d58053b5fb37a227bb25a3263bca81f5f4cde37f55158f1e2d4a44ea2b
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webshopplus.nl/app/webroot/files/userfiles/files/fobexemere.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612752c402964---bozaxikugukegojav.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/83877367953.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/38031079096.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160790299f0dab---bewafuzivuwologakuninafix.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bd669123e6214216908c3409d51cf092/javifebatirikixu.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/50955e81da82a4a7c46b3604f6b2df38/72534978401.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a5c286ab---18760216233.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35157580950.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/49747767239.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0bde96d7970f6d5b7b7dae062d141b20/47280434819.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o03blrcf082quk4m9e6rks44up/47202840408.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6946f7f27d---43923869866.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5262f79ff596af0cf6c0019b4ef0aa72/71608446495.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/vhn6l46uuq2398rkv2ji1b7fkomf1jak/30445851239.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/lofidovawosoveluwatowe.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1f309fc59e17a10fb0716c0aa966f114/56634152832.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8088dde88---visepokaxijisoxowuxedo.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/zapomizixutodi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998d8c8735f---63995740747.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/0m41a9ikp19unvci8vaabtth7q/44417292098.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/39641837712.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/72fa8aba0d447fa7748708832f8ecf33/zorudebojemivaviwun.pdfIn PDF document text
    • https://buklibry.com/download/instructors-solutions-manual-thermodynaIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=thermodynamic+solution+manualPDF 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_off00012951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14168 10812 bytes
SHA-256: 056e2f7850a7ad0092b06f1170d541f2482734883f74e97bd245798a01b6323d
font_02_sfnt_off00015a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A33 22500 bytes
SHA-256: f77f3f90a00606ac7ce6b8e7586878840f1a58549c74cf0e0079476841e84a72