Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b901fa71b582ec2…

MALICIOUS

PDF

90.8 KB Created: 2021-07-06 17:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34dd2906fbbce51a8fb3edf648d662e3 SHA-1: 8dbbad2014900ead36d5fe8b987f7893a3744e12 SHA-256: 5b901fa71b582ec2cd40cf83b0fe01bc582719666bfcc33c555865b0311f7852
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised websites, specifically WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect the user to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1561bad526151082105481abbb4ac5f9/zomuzipepixi.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/xokibuzogor.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd312773b9---64373532143.pdf
    • http://thuduchouse.vn/pics/file/33355884542.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d6f69b698443743998771c323dfa5bb2/gaxowusufibuzoneno.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7650631f49d70f3507065f6262bc6042/vitamivulokorinebemugog.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb489efa61---rasiluxinimizubaxuvizu.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/85f610e2f58c5360a0c7cd535b86aa07/vamobagupabinewurizi.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc694ffc6---xikapumuje.pdf
    • http://scandirent-new.ru/uploads/assets/file/788951621.pdf
    • http://younewstoday.com/task/userimages/file/81586965023.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4371d4f1ee---fusebavomi.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca66484fbb---devapinotikiz.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c3f63443560dba24c980119743180c81/14080434047.pdf
    • https://reniuved.it/file/47426844436.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57debb710---83844650071.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5ff73577---japorunizarozasigisisi.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadf2ed30b---fifagejutojiribes.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/3lp48510e61chuarf7vrvloqb8/89805449410.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/si30kv6pnel77p83q2hutiusl1/65857267474.pdf
    • https://associazionedynamica.it/uploads/file/kuzuwamani.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/sidavapikowotuf.pdf
    • http://www.chatanakonci.cz/userfiles/file/5293037099.pdf
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/90123759389.pdf
    • http://asijskepotraviny.cz/files/file/42389480441.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vi4v2eqrgs0acbo1hpn13jluf6/memeloladipigewediseneleb.pdf
    • http://enricobarraco.com/files/33330413637.pdf
    • https://ive-cal.it/file/nixikurazululorodelitunum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=brene+brown+burn+out
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes
font_01_sfnt_off000117ba.bin
0a079ead7171003aa5433e8026b929c914ed26e52d84b370880aee2c239a30cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10012 bytes
font_02_sfnt_off00012e29.bin
2a44a3370ddc7016ba385d3363b6e53edbb59e0a0e39655901097122ed9aaf0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 18220 bytes