Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b071b1b47e58ce8…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 22:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 61747db4b77aa92ace3a5e403206e158 SHA-1: 44e361ab42a6d51e215c7c3e113ab7e9f9e8bd19 SHA-256: 8b071b1b47e58ce82fdf0fd81e703dabccee1dffbe8a940a845c42bbfa420337
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The presence of these elements suggests the document is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=dark+stage+of+photosynthesis PDF link annotation
    • http://joy05.com/_UploadFile/Images/file/94013774268.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/80117220326.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/dudupuzijaxidarefipopagu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147e53208d99---lofevi.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/10323086936.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/28b7ea01b31b51f70cfcb8d14282d540/jokigunusiv.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/wasazoduzokirixofonipipuf.pdfIn PDF document text
    • http://trubaopt.ru/content/file/8029970710.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/89897298923.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/logefopamologevubi.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/86654356801.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161519c1b91286---3122703080.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3fv29bc3f2peic3es2tncvcg55/25328886096.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/56853586339.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v9a7vd1v8h52ifh7at824n9q6b/duwaniserubi.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/80603753704.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/gezuwozularepidemimuder.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/fojiwunisi.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/jukexitexikibafajopa.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/24579204532.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/430660172b30ade072e054705cf26615/93525019209.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/62441816931.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/80990926400.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_off0000b2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F9 10796 bytes
SHA-256: d6d4eebdcad95d1e6c7a4b3e0756cc49470f6e5d23f4db1b01c005b672f3caa0
font_01_sfnt_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 15568 bytes
SHA-256: 7ca1a396e7a04f1909e7a3e3c45d8054451ee233361271c7176ab147c23b4b58
font_02_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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