Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f7e52bcd3249f8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 03:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 798d74c53a19e5be7e1495a10d486d70 SHA-1: babe75f62aa05f2b571dc8d9609b01e31e4aec18 SHA-256: 51f7e52bcd3249f849f3c3dc18a4b556d1fce3166bedf1b0612afc8370c7db32
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious content. The presence of a download button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/38d2877865d5552405f78a9f433a6847/zonob.pdf In PDF document text
    • http://keacg.com/upload/files/sirugugose.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/fe0dc3f0c564eeefb0103beb01be9dd5/16111550991.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/96917135190.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/gikolisapixalupitawodag.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/subademefolirebolabame.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad1f28fe3---95657284445.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8105a92d9ad6920b394e1c75303f3c0c/99619795157.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1bo488ord37ges5ehnn0u7cgdo/jusuzilu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161065f783558e---palepabivugozuf.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/79580566922.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/besokuviwefite.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/06eaea84928241552ae7f78375644dd5/612778324.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e8014173a11c3101bb59165b0d364113/xixafapuzabonevuk.pdfIn PDF document text
    • https://semut73.com/contents//files/tebisaxebadox.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab2b5fe0a---kofuzowefafot.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/47900047619.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/e124e21323f4c14cb51861176bb9d72f/nojabolewilu.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/suniralajadoboja.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160718a046e0e4---milokevapepimudawukapet.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/purosebitovate.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/bavixujaxapebadizus.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3f8218cf---65598184796.pdfIn PDF document text
    • http://llux.vn/uploads/files/81645657489.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/zomenebelapowibug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+to+png+zamzarPDF 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_off0000c312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC312 10464 bytes
SHA-256: 2a2f779ecce2bea5f263aadf5ccd28376b9270b219aa3795e9bbc18f421bcbf7
font_01_sfnt_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 17532 bytes
SHA-256: 780da85a56299a27bd2c8eda0b9cf0450a9d3e54d7734ca783cb2c9801e51df1
font_02_sfnt_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1