Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70876e816076f75…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 14:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b34472e1f235561775e2bbb7ab852b18 SHA-1: 1611e2715a7a01511420fc3692131bfd90ff2fc4 SHA-256: c70876e816076f759c8635a2a90b2b5fd0722bdbc3414930fda38caa1a41c5e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f5bb7e818705887ec9fcb818b4b10c12/xapotiwasepujob.pdf In PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/99dac630b89d8d37244d666bf0ea1c92/27511298743.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/kogagarisusexotamefa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcd88d0e4---46394371387.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/pusofoxotumilabuluvaw.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/17066146669.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/oubo59qu005rrmlftl1iil5ir7/nigagabonaki.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/giwusejosone.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/8580548561.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/49565469874.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/ruluxuvixikajepasukadil.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31492b5730---89622069044.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bff3283dd---11722143232.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/kipilevakidopekito.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/situtup.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/lovipojinivojetawefosikog.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea6d82930---legenazotexilijunawaxogul.pdfIn PDF document text
    • https://wonkingchina.com/d/files/57786905062.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/10882920939.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/9925056590.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/27209906824.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882033bf8a6---sazerejudogabafulotite.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/zibodujakufiso.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a0dddaa18---lafafuzejimog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=futuro+semplice+italiano+esercizi+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_off0000d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 18664 bytes
SHA-256: c416ad58124324d3ba26da8c3ba9ea16c43c9bb196b6c61d11f3e15ea8106e3c
font_01_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 10916 bytes
SHA-256: e4c29b0c8fe25d4addd171d2166bc8ab8f85242df24f15c8366e7072bcf1e519