Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6fe0fcf0eae9d4…

MALICIOUS

PDF

90.3 KB Created: 2021-08-12 04:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 42f0a78cc540f667a69aae849d6f01d4 SHA-1: 8c0fd1f258b39d55c8c75d712c9128f70b3f85e1 SHA-256: 7a6fe0fcf0eae9d4360363f1dee464f7a949f99bcec49b57a91c000c87576a43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://www.hon-ro.hu/userfiles/files/14208316649.pdf In PDF document text
    • https://muratay.nl/userfiles/file/tekikaniwosavebu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8d0595c1bd5be936e5f5a311d475890b/suvofugutesedawibazanu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/43184715094.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/59245843254.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9434f6aae0---bijalupimosupe.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gokawexilugakun.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kidiwelaxerujamenatafad.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/mijadopez.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eqjhaoemoek8sa29edd4i9o8d5/74864713045.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/5688266641.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba16f3cc2---mewowubatiri.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/39392508031.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/27581754656.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/15955008235.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/91413108303.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/20876675627.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/376346d2d959f0808e70d48972a4b3ea/69179717315.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/togugowoxepakedafifewe.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/56714182292.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d1e89f0f477654de8fdad2cc806dd2cf/renebevizavolat.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/31917083533.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caab0bd314d---5877410009.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d3673d8402f856970bd6a96537b7d63d/vosifovatepomitopi.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/44938232713.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/98246095885.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/99367865716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=loan+take+over+letter+formatPDF 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_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 10232 bytes
SHA-256: dc35cf3f7da953000dd4f41ac5582878fdd9b157afea85d461412e2d2817be65
font_02_sfnt_off00012e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2C 17484 bytes
SHA-256: b2f2714db0fe0e8ceb8443aed4b5ff5dc51e38f11423d28dc1fd6e3803ad64d5

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