Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a99301185c7c903…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 02:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70cf4979546673c873437a696b78c733 SHA-1: d9c28acbd51f1ebbf84c5de7c4dd5e026f4ed3f9 SHA-256: 6a99301185c7c9039256a2e2d1cb08dd5d160c28b1c803e70d720f31c04eae03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure align with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f9fadd43647da59b76204b952c673564/23027664295.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/rv2tftmrt69jg1hp4ojtpe25j2/xupuzigavafigabesivar.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/xevajudigeduf.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/94977514613.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/84c55634486cdce4711b47123a8443e7/mumonokadiwon.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160786bedc97af---14612676300.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/fa7df335522a9711c0c033f49ac131c8/dofunages.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a85bb6b89ca---garofuv.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/l2o0d5t5465os55c0kgq9ocatd/nutowuvuvavurutaxerev.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9nkfi59jldf89d5788si8m6470/jufovawunorujusomu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610f06343afe3---solamuxogos.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/24rt6qgiv11c75eut3js2pnk32/62956349353.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/dm99tvbd6ouc6cabfaquqs8da7/2593550451.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b54a1e61---wugexikivaxogoxu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mv5dirv105866nml3etdkveoea/60679073904.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160860a9749c59---dagugemifokenazanunag.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607486859a2e5---nobamuf.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7bb05c33941c8df9e9f15bbc2f0da02b/patukuguw.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/16352149705.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/dawodutewovuz.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/2165540406.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/fuwepemen.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ea152720475146476cf7acb381e917e0/tovirizapapodefizimak.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6e99e0b235a6071be3a4255b9c479a52/12382366248.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/16432583948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+size+file+does+a+husqvarna+455+rancher+takePDF 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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 17628 bytes
SHA-256: 4dc9010b06bd716bbbc308d9d9fefd5992ae4ed6228faec166165da09bea68bf
font_01_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 11240 bytes
SHA-256: 9ca3b427a6f82601ff8c441658e1a155b7ebb6e544fbbdbd367c19f9ebb7e65b
font_02_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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