Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e8b3dae8cb2636…

MALICIOUS

PDF

89.0 KB Created: 2021-09-05 19:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7bb492622e8e86415f4649689f2e604 SHA-1: acdaaccc25519613ec84adcbfbbe215a70d99bc1 SHA-256: d8e8b3dae8cb263670e9f41b113dd5aae59e13a8f468937db9c176d4ea458853
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to obscure the true malicious destination. The presence of a 'download button' lure further supports a social engineering attack aimed at tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/48ractcsmta3cp5tnb1o3k09h2/kijexelodeletifolamubani.pdf In PDF document text
    • https://stvorki.ru/files/file/kunevovupafizeb.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210726035935713.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a6c4f13c---gixemalugobepokafe.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dilefulajoxowevaropi.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-9/20210809002643355529.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/7582587415.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/nikigofogu.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/nazaxiju.pdfIn PDF document text
    • https://wittnebel.dk/file/37212643746.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/40996901438.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a676b8641fd17d88a3df93a2fe87a585/1410572656.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/13037638898.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/mes13oahfphrlq1oualiefvpdk/gomov.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0605d88e---90111923172.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/aefc83fd95742affc402aa5a51d2a10a/37707547473.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g6vb0352q1i2phde4a2641vscm/temeriligoxi.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/diwifijigukubugoge.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/knep8r3nmm0nl06rvags2rmo79/felunegatonorexi.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/dapibi.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/2819562740.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/12rq61fuh8jsv63rq7qdjlq3up/judesiwagapaxuzusasefev.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/82342473280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mca+entrance+books+free+download+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_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 17020 bytes
SHA-256: 5527b7c238d156f1db9aa45bf6e386ca429f70b107c961be3787d599579e69a0
font_01_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 10832 bytes
SHA-256: 6e2e9c1351e111c940134037eefdbeab1ccfdfc141480607108272bde0fa0527