Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4016faa97d69b32…

MALICIOUS

PDF

116.9 KB Created: 2021-07-23 04:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d89fea924d10e3aecdc59d4805a9fbab SHA-1: d46b03896815ed75056aadd7be67d6858ac41d6a SHA-256: a4016faa97d69b32357de663dac30d342f5237b9d51c779ce812b5cb9968fba9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the 'SEO_DISPOSABLE_LINK_FARM' heuristic, indicates an attempt to direct users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f070df9f287---23468414261.pdf In PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82737466380.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/xafowajejabafigivixugos.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/fajefawesupalamuli.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i6l4e904f245auqpld6t48r1um/toweduvuv.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f70f54fe1---liwosuxav.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/51350542854.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/79497383840.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/13038159551.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de1f47db0b4---kosimojoxoli.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add3f990e0c---dikabekolojalewer.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/doxuwupusuxa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/c8n79bdctljjvm340lqrc1b62u/4225306411.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c47d4941---69065738865.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/71156549356.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad403355d---kejuf.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbb07fab1---pesaxajubuma.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/bitugugowako.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082602f9652c---18068815908.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/20374249035.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade7ffe6a2d---pitelinakufagiluruwifugup.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3bb78882a---kabikok.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54145cd47---84157203843.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210703122535.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/dufalut.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/52789576247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=physical+therapy+for+luxating+patella+in+dogsPDF 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_off00016450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16450 11216 bytes
SHA-256: 7efafcdc6e18dc849dced347b432dcbe3fba6a232a458dd041f6093e4c669b2d
font_01_sfnt_off00017e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E62 17708 bytes
SHA-256: dccd737d363b5a2ca0224e1f7ef9ba2d1d6c741eaf099d349840d50b54c934dd
font_02_sfnt_off0001ad04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1