Malicious PDF — malware analysis report

Static analysis result for SHA-256 42866617ab4bd7f2…

MALICIOUS

PDF

94.4 KB Created: 2021-07-16 13:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02ecccb458aafa0ec5288995128631c6 SHA-1: 7598a2d3bcc2983d576face716afeb3421821fdb SHA-256: 42866617ab4bd7f2c057c7246aaaa4024683c93fed6a5d7f34e6f7d29ec11684
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which are WordPress installations hosting files. This suggests the document is designed to lure users to these sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4efcd03eb---telunorilebanubile.pdf In PDF document text
    • http://yljx.cn/images/upload/File/70269101444.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b6b2717774dc34507f096b17fa1a4679/vamironutabovabe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b21af8a44e7---2189828661.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m30f0selvlgsfj260unac9enku/mojemiwuniz.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/badetadoruxar.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/batufapafaselekiputokewe.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/alp3r0ls7sb3m3rf8d64k20mh3/60468452537.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de096ea915e---71088537320.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tsb124uhksnu615dd10ipssrco/zisogigar.pdfIn PDF document text
    • https://successalpha.team/upload/files/12175616112.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f03b5db258f---kizowunilalo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/udf79ovi19shnphljakmem2qdb/79159206670.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ubsdom5lvbgeoo4br259qas2nb/83676840952.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16075b2f2750cb---30269108590.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a679c021273---bosuzamowe.pdfIn PDF document text
    • http://nessium.net/userfiles/file/77732132150.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4da7d1655---29640541523.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/61080172217.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755e6854295---rujevudupobeni.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/8922362661.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/36848653072.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d2469f44af77400776317fefb0a81ea6/vodagimelofebiparejal.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/dc5091ba4852153d58a16b3ea9264f2c/25085797696.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083188fd8b54---jidevosoru.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/funarosewevami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+does+wide+bench+press+workPDF 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_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 16696 bytes
SHA-256: b17f16811d9d132420bd05ce46e8aadc23f8a4c62e51b42d2d7f8635b291b74e
font_02_sfnt_off00015320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15320 10876 bytes
SHA-256: a2e3c2793da86b1db5af8dfadda43c80014347e8b1f093aedb5734318b2ba775