Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8468a54cb77655…

MALICIOUS

PDF

93.6 KB Created: 2021-09-13 18:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 935f2362e09b67792b0ac4bd48f61338 SHA-1: 6a6d67516eb73c9798630287d1ef3a941b4233cf SHA-256: 6f8468a54cb7765536c662f0271e8c8a32a497d3d19c7312ca6ed08236ea9f7b
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2951fa24---wutakalasadikavisenosumo.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c647c98683---12126078033.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210913111059148.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/pegirufimedobejifuwuvop.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/jerovoxoreforob.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/kigebosobagub.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/zitekobarivefibuzivasumux.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/74749025671.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/2286192822.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/fiwuzorekor.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/tivimipubovomebefevoji.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/pumowi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/sirub.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138612188117---beremusovef.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/gefijoporavedevumogid.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/zakezudigugukawetiz.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/62824344734.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/sinolezozumevekopatixatan.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/88566152057.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16130b51a1f70c---rilidixajudidi.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/23818551048.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xogizupaxososofobekixo.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/xawejujatatoxe.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/70920175560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=avancemos+cuaderno+practica+por+niveles+pdfPDF 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_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 20108 bytes
SHA-256: 36a6b810b6ca07fb2b3b85dfdce4ddace632202ce3ae34a87b6b9ff7ea3a8101
font_01_sfnt_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F54 10928 bytes
SHA-256: ccee8873b2735b6ba1254b5f6957ae2effadcbfd1e46d256742649fdac4c413a

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