Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c92a71c912dc0fa…

MALICIOUS

PDF

82.7 KB Created: 2021-08-13 18:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac7690d60225863c3a70362e9ebfbd37 SHA-1: 384c20dcbf7b6f1e3b5b81db41869dadb64913e3 SHA-256: 9c92a71c912dc0fa01932db2c3cc88e4fe7188656fe92ca52546ae29273e1d54
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised CMS uploads and disposable hosting, a common tactic for phishing or malware distribution. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a business email compromise (BEC) or financial phishing attempt. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nirmalamathachurch.org/cms_uploads/image/file/netavejopedupinafa.pdf In PDF document text
    • https://fertilizergranulatorprice.com/d/files/besasonufok.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf4901031a77de5183c584b4f4203e92/kusov.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f06fcc14d2eb561b3447972ab1183366/47155975460.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a638de5a4---32359445461.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/5632032877.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/95e53fd7109c131ac6bfd9da62801cf8/49979371711.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/nidegawifesibeliku.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/dudokafutarazux.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d02d62d96a---rajapoxekunuganeriveleze.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b5644c639ea9a50a22c4f64a0bc296f/nusutowezefixa.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/11308708192.pdfIn PDF document text
    • http://ruresept.ru/files/file/49823437830.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/31561601070.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb9f19340---kitadawajolixoberosa.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a0413d353eff3c3591f02186eecd6792/sawevusurokivobu.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/40370032732.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/momawurasaluzaremotasiduj.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/11871240716.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078f56d9670a---80301391177.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/fa2466724855939e8afe6a56ae838130/76190066795.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/majekenutowem.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59a5499bc---xojatiwiwapapujev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+update+my+garmin+nuvi+255w+maps+for+freePDF 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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 16384 bytes
SHA-256: 175318c340467d9cf1a79a8b90c94946deec7db00b82e46461ca66830242dc5a
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 11408 bytes
SHA-256: 851ff830147141e8df5e64712d8c2a56cca8c5547999ff9cc589aa3a8f31dd3b

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