Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedcba98b127c54b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 22:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef5e2e5c6c840414849977ac79f9f2f6 SHA-1: 1bf364c3478e23b96b453674fdd18e762c851307 SHA-256: fedcba98b127c54ba94f4512f6d1ee144f40803a58729763f042568395f62395
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to external resources, many of which point to compromised CMS upload storage or disposable hosting. The ClamAV detection indicates this file is a known phishing trojan. The presence of these links suggests an attempt to redirect the user to download a second-stage payload from a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2932

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://www.karelo.com/uploads/File/fivedazesatoruwulomoxuli.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c33228c3422---81552220069.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f691f4499a---kuxurajimodokume.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/91756926375.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e6658b4bc7bd71f6fe3f419567eda9ae/temebulizozuretabifu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb999aacf8---sugeberajan.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u0up552rdd07dmb6k6ltljtca6/17955827729.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d696802f4---peremutugemosowudexikilus.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9beb86fe1cad5c22e5c18c8d6985a28f/sifum.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/00ef1c5085f0bfcabf91f94d6d7d0893/13987767470.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9607431ac---88164974252.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e8a634e1---somivagebuzabixa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbceac1ba4---7442944327.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af8d8e4c3---zuxujabikemodusiwovipoz.pdfIn PDF document text
    • http://plncse.hu/php_data/file/lotijudirogip.pdfIn PDF document text
    • https://irantruck.ir/data/file/43379912118.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/26260205856.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974a6204b0e---vatifokuli.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d0b4b3f698e0db99ad74d6b8c2945e23/54865692329.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078c847029b7---gomeb.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pakatupomimonobopedemop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aef8e6226---78381654628.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/61953523890.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/57941514770.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/dewerox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=all+namaz+surah+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 21744 bytes
SHA-256: 5192a3b46c1949116ec1c651c7310847a4cb163a840711800a3f2c622a5491c6
font_01_sfnt_off00013840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 10460 bytes
SHA-256: a27fb181210f879892cb1d7ad24db2309cf97324967db73f24d02c0bfcedf524

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