Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fd06f8464fb202…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 06:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12366017548fcde34e336ce5e09646d5 SHA-1: 4ed259d7402036be908d1516ed9fa3e00c52d317 SHA-256: a1fd06f8464fb2028b5827e1a494610cf47783c088e17d0ce2a5227a4f5c6a7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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
  • 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://gsprojekt.eu/userfiles/files/xunubuzuxevunifatugegos.pdf In PDF document text
    • https://cleaner.pl/userfiles/file/60045647908.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/lidowopanuxofonezuredote.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/18496265895.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/foditofarovusebegafibarun.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/485471177.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/62305523981.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3f36b6e4e---57597316181.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160948cb516870---xisoxotiza.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/burevugunavukezogijijuz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/373af2c788c02b2153dc106e1b8714a4/wogaziripodu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c3bada0a0e6e6ea6080086893ca56b13/genawatodowilukutema.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/17565900120.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080dffd1d0f7---vusajidotuvelisi.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/97094307527.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/topamibudimov.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/53601965493.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/diberebatanolemumanokuz.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mejitoxopirogivopap.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/fuxupokodavi.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103b017213c9---28955848456.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/63423262106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=canada+citizenship+test+questions+answers+pdfPDF 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_off0000ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA82 16844 bytes
SHA-256: f45f7d8b72077bbd105d21dbd834fe7666589f06b167a23f1c737053a970a8c1
font_01_sfnt_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 11096 bytes
SHA-256: 6b5977bdd0630fa2b9b933910d147a62e7b9aabbe97accbed693491e4ce21a99
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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