Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b316d5c710862b0…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 23:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01077ebfa1402fb9e3b8f03e48a8b39f SHA-1: acf3ff9c6689dca74f83a2a672038d528fa08a9b SHA-256: 4b316d5c710862b0d9a4ffbeb5ea269ae78db0543300946c6ee60b82a8d634f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to compromised WordPress sites utilizing vulnerable plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest a link farm attack pattern designed to obscure the final destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=bible+verses+on+lucifer%27s+fall PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169c0d405---kimavitivixeferobiji.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c2abccefb6b4a461410a1f724831bae8/likoxutuk.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/jojanarujexu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608240785d5c3---95943094542.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7bf1167de---lagobobimajowovofududuvog.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/77893535c3eeb8b10374ed9ca432b18e/74970609310.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/abe85c6d1fefb2c25f9d456515e506bd/92290482971.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/93023929333.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/jagamapafowub.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/89fb11e544aee4cca63cba30bc60d2fc/30960945372.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/funokunodajosexiwo.pdfIn PDF document text
    • http://0930actress.com/files/files/17389318233.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160864495c1cfd---91562050789.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf5d05e2d---piwemopenazekopasovotibub.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8d888a3d---40211745454.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hg905ssqimbnikn5ttc76aotnu/60080557271.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf58e887c---80472202090.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f0934f98b25067962d991754af871e83/gorutogufewadirulavefoti.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7c561f0b---jikedijajexapadoxesona.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g8rk4430bf2iqhlvqtjvja6ia4/34357879883.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///51870766871.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d89624ee---57343150203.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e673861bb---15824727086.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38d48b3189---zuxalomoruxexatubolojo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608929578b22f---35082480629.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e16fdab07---95569074010.pdfIn PDF document text
    • 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_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 10624 bytes
SHA-256: e83fc21e5962beacc8ce7c845bcb8fb278bd1206189efc1bfa0106d08d92de2d
font_01_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 16788 bytes
SHA-256: 83a9470f304e8d7b75020ab5dd66113c15cbf4b0eeb49173e1176d77cf00a050

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