Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7b201ffcbbe9f9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 22:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4e8a75cb5c2fa7e1db1da0fac04cd7f SHA-1: 7fc0222852b923c2e411f3ac1c03f70832b7c5e0 SHA-256: 1a7b201ffcbbe9f99dfe106176eb2cb6b6d50513a777e5c3daf143c05f8879ff
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload directories, a common tactic for hosting phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://peaceinsrilanka.lk/userfiles/file/97625473340.pdf In PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/vinanakizov.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/57926688118.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/gepegoniladanemud.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/jitibakuviz.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/30288711325.pdfIn PDF document text
    • http://soles2walk.cz/data/file/42223240456.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a8d83dde645aa30813fd412224d34a7a/95204985493.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3qteesutj2je1aaq9tll8e83pd/64364676991.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/4ea7837023335025140ddc431a35f88c/wixonikotuzedinuguno.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c675c82d3f1---zuromafiwifide.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/609d926df8167c65f0abda2870fb89b5/63178116621.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/54019334632.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/ziwolir.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc485e854e3---22113620758.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da714e257f4---buwusiligifotifof.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/861b11ac2fe95bd89e7b3de6079cdc2c/zidub.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/juxojupesobifosinepudataf.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4571c13596---warenunoniro.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/mujazodugomagovudiw.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9a23b0fddadef19600254adb0f69e972/7202478793.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-22/20210522020909571242.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/tijanokuvek.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145cc331e4---mikovatosepuvol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=if+the+lines+joining+origin+and+point+of+intersectionPDF 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_off0000bfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 10980 bytes
SHA-256: b014c4cbde6edfdd51547abbbd8d2c9bab67854afec4dcc9ae7007d90d80891f
font_02_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 19328 bytes
SHA-256: db51c86498137772a2ae9bd5380234c23e785775140a38be2a733e1835093085