Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bb573632570c5f…

MALICIOUS

PDF

95.9 KB Created: 2021-07-23 02:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf93d97a3e3e445960d8243b7177a581 SHA-1: d09224b841b1f7cc6305d597b3bdfd4a5377fef3 SHA-256: 91bb573632570c5f094d5490f2b6cb4d9db9ed143c444b79031104a69fab81d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba74b8065e---gazifusuto.pdf, are likely intended to host malicious content or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://communeouchamps.fr/userfiles/file/17538168595.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adc72c91245---10324012075.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/mk6ua1vjoposecd70hsdvk3s5p/velugoziniwuva.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d32362400---sukasapuliz.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/9ivo6087l77mtllvvahmcb1170/vuzususigilamere.pdfIn PDF document text
    • https://basisnomor.com/contents//files/mewet.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/khmklgiaem5gbr43uh6javf179/25094617582.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4ac10002526b5b4a6ae59f599aefa6e9/70838640650.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b221bdb58a6---97954122892.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/89842265495.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/38274156992.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9859318fb7625fae354fe4091afe5b6f/gojufuzad.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/mudurepazinisakasawuga.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/32512824542.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tedc07f6ilrhs035ujg8c7vmu5/pabozetodevone.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081348fdcb9d---daguxivotabemafupujuronu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/ganokiripezewinu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fe7ac58c---82833374893.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/21255345205.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/vurinidokabaderajuju.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/dugodovawijifovaforax.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/totanadujovusuluwazorob.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba74b8065e---gazifusuto.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/narosojugevebozipe.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7a3b05ff4b608839dc87ef787f3743a4/xawamoduvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bbc+interview+questions+and+answersPDF 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_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 10908 bytes
SHA-256: e15eaecf52634c92e55ba3abfd288976d536228ef4b85e058dae6dfdebdca17a
font_01_sfnt_off00012bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 17360 bytes
SHA-256: 9d2f1f47534ebb42361d654b0a4d146790554dbdc5d3045e718e599b35c8f900
font_02_sfnt_off0001593b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1