Malicious PDF — malware analysis report

Static analysis result for SHA-256 af499314d8989c7f…

MALICIOUS

PDF

94.0 KB Created: 2021-07-22 15:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f19efc92ebbef983b48f364f58dd92a9 SHA-1: acacc31c60b912d17fd3deb39b0d1d63878c0fd8 SHA-256: af499314d8989c7fa9ff8817e1ce69be01d34daab2f490094b2292fc8fd73803
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to direct traffic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple PDF link farm heuristics further supports the malicious intent of distributing traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://uni-farm.pl/ckfinder/userfiles/files/35033088039.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tidubikipawiva.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c05b878b---tifomanewunovudumiz.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/25098331208.pdfIn PDF document text
    • https://laps.pl/userfiles/file/zutalamuwibekiji.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/sezivewibazegijagowim.pdfIn PDF document text
    • https://actorconseil.com/files/file/zopuxik.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/13608407735.pdfIn PDF document text
    • http://wawa757.com/uploads/files/mexafipuxo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f172837d4b098a5d25fe2f8b73f52bd4/7408809241.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd34191aaf0---pagowabafuxidoka.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/v78k3jf1acbo3mlejsdg55bmuj/tobasoreguxolaxi.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/mfkovg9r9of4vqi6h1abg10paj/wevifamod.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tiaa6lifhv2318n1c727er888m/xikop.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/8is7q2abnad3ohsnstehrarqk5/nudalurexawiregug.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6bbde267f567a777b8f34c5b61e102d3/rirunamutujudokev.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/puzoborumobikonuz.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b19238c3043ca6640ba73024574d3844/xajipuboxerug.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cd97a8ca---sixekemovuwasolutoziwas.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/13545074631.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/940e1f670df0a3b3a233fd83bdf6d28f/tegewovabijazasujiz.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9b62f0316---32250096213.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/57794a808aa40e131467e1d8bf77c04e/91936494366.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959f4fbb386---6355845852.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a288d53d7---10979293705.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/wekeluzajisokutal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=testicular+cancer+radiation+therapyPDF 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_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 10788 bytes
SHA-256: f2530b067538fa05a4f32137512fef15c14e06f442e2a5ba912c0e8dcf0109e6
font_01_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 17244 bytes
SHA-256: aa9295b1c5e14349f7fde52870dd0a01d9288a6fb63df77920456e06afdbf471
font_02_sfnt_off0001512a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1