Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c8c9096051ad54…

MALICIOUS

PDF

87.7 KB Created: 2021-07-20 00:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 99809385cf8f9d686ef2680adb9c31a6 SHA-1: 2cec6f7f0a11440bb185859902d46d7ed365447c SHA-256: 34c8c9096051ad54306eda5422f6d322ad6d8d64d4d28520704b13123ce53964
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on compromised CMS upload directories or disposable domains. The presence of urgency language further suggests a phishing attempt to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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 https://standsimulator.com/ckfinder/userfiles/files/34612884517.pdf In PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160acf34c3aa8a---90272819830.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/dubudet.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/rapulebusosakogatepalisax.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee62b617563---16180191820.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e62021b12a4---12863579769.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5ac31597b3c969aca117f54e5afb5dd4/ritorul.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e89d6f0a4a70e6eadf38e65d5b51dfe/84406944366.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/18619826776.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2a3440c6---55948372838.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/80454660889.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cf5bf35554787bee93f838797c671c3f/ripamikagenekopemun.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985035ae17e---88497395358.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/melofugekijovufulelivujow.pdfIn PDF document text
    • http://email-database.info/userfiles/file/defopavexejisepenom.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/77bd456e7d0df18dc692700b2d2cf6b0/32388321190.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/66803542465.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8269addde9---ronavofamesulafebivepux.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77534837c6---kazavumufabivovunowiri.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/12815186853.pdfIn PDF document text
    • http://kelvista.lt/images/files/72918529950.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b05ea341---tebisobolunulebo.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/41666548685.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/94597a59da9829ac2d6c7cf39582ee06/87434451708.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/4d944cb0b00cce4148a27179de5d823a/rezopanen.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160750306db77a---sanajad.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db50b320dfd---loveginezunubudekaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=why+are+many+plants+greenPDF 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_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 10592 bytes
SHA-256: 4c4fa90512431b99fd54fc61cd0b555b001f10ee45e9ebf5d28ec05ddecd1d42
font_01_sfnt_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 16600 bytes
SHA-256: 8601a11e40a291597665b31f0d1f8479bffafc80234698b3c848d85ade6f7660
font_02_sfnt_off00013955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1