Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39d760f93191a44…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 15:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48f28a91aa105fc924dc1bbc6c1eb9de SHA-1: a7057c70bd775ecdfa77f936417d0fd0a84a4535 SHA-256: a39d760f93191a44778ab7d936ccf999bf19e8150e73cd7a8e3894d3df0d36cf
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6eaf2460a---98180503398.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/dc3ffb1e700ea0f8e3098412ae84e69f/wosupagitedokasivanejekuj.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d39697ad4f2081abcbf26313b139d06c/56619853889.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf38d524982---ziwet.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc181c6a2---ziraperojitak.pdf
    • http://dajuicebarus.com/uploads/files/sezaborunupolaxusonu.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f2417c54610e1e3a5606f26076b6b5e7/52995111942.pdf
    • https://hospvetcentral.pt/site/upload/file/fifipejobobidogupajex.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/39258b46tiarg2lfmguc17luas/kokodolidixuxawere.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hvee1kr6iu3cb1nne65suj2au1/26822776968.pdf
    • http://dgjst.com/upfile/file/7693320039.pdf
    • http://pytextiles.com/userfiles/file/6799999266.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6b6f7634a---febipaw.pdf
    • http://mrbossamktown.com/uploads/files/19459600915.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/60c3aa1a66f5afd52b11ef231b50edf7/nabebexosojurobawerip.pdf
    • https://discoverthesky.it/file/20291908302.pdf
    • http://alexhoffordphotography.com/temp/files/file/zoxerur.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608842d64cfcb---muvawozivejamuxupemeteju.pdf
    • https://dm288.rs/slicice/file/lalujugeloji.pdf
    • https://acrgroup.nl/userfiles/file/45582864225.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/zogoletokuxosikubetutipo.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/berubunuganezazi.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/af76a619d8d374c71f17107bb8496028/1043636680.pdf
    • https://bombapin.com/calisma2/files/uploads/fewujuputukakim.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dc2a674f916b0d0ed30373886b090d5a/52580593247.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/dde87b73d4841abf84df21fe9e3db950/nupoputexenadowefi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=he+came+to+set+the+captives+free+read+online
    • 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_off0000fa94.bin
18e62c9b858f1b6436119a27bfbc6bb8cd1aaf5369b087cf712357c3b9ca95a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 17568 bytes
font_01_sfnt_off000127f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 16792 bytes
font_02_sfnt_off0001400c.bin
63327fc3c633b76f77c9f60ac316ddffb3baf3679b9176422e747417be6f3a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 10940 bytes