Malicious PDF — malware analysis report

Static analysis result for SHA-256 da599cb7276a0b42…

MALICIOUS

PDF

87.4 KB Created: 2021-08-26 00:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b6d63f08ce6ddc4f29e13d7518a3bae6 SHA-1: d299c16c9247ec255df52fee56b835ea9ec0624c SHA-256: da599cb7276a0b426d6189375d6dc5918b16406708511cb1d419948bbcd2a6c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The presence of these links suggests an attempt to lure users to external sites for malicious purposes, such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7f6d09508d2ddccf0d1c1f2ec96d296e/38027842184.pdf In PDF document text
    • http://cocoal.com/uploads/file/93713812434.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/pokumejaxupepuwiwaxuw.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/difamugixudu.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/1507359472.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ds0e68ggtfgkjceejlrs9gmksn/migidij.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/38a9c3f0469d73cae56e6d3f17bb53e6/guzojexivalitugukodezopa.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/retivujofikatekejevo.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f7f7d449---lujogipevidibewime.pdfIn PDF document text
    • http://mfcpavpos.ru/file/85612334349.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/40082494013.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/dezup.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/gedazazamekufutowujogafos.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/jatomi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc7f1edc1---15772822868.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3a82ce18---sovamowapulufagabiwimif.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/8716918850.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/56303736374.pdfIn PDF document text
    • http://bronia.org/userfiles/file/jakexiwanepojotugisax.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/miretixeniz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f516b399e8f---91509135163.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/83477335853.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/82076229684.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9405b32a0c7381ee0620aa871a05079f/bujikitedix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=you+know+best+meaningPDF 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_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 16484 bytes
SHA-256: 4fc0b9f8049053740e31a958b9d2c375f696e536abcd1b238962d565de592399
font_01_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13776 10708 bytes
SHA-256: 561e53b1334dedd4beadd2defee736a51134b83c086b6f331d90677b8af54318

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