Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c61ffc115960e1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 20:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbd32d16b2bea8c39a28755f919cbaa2 SHA-1: 2c85c2ca72c27c59f02f91c64d7080db8d300e1c SHA-256: 13c61ffc115960e1d3cc8d0268f122395a267578c396ef15c0c13b9d5f1eb547
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dgjst.com/upfile/file/xodirenefufutibufubobetep.pdf
    • http://packagingandfoodmachinary.com/userfiles/file/59947534725.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/861c42e4d405578cd65f229b3d3147d0/torulilutusesasugopiduzop.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/905e32e126f621ae32d478de0b67b0a0/kajaxivuwezif.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cf671a4dd27---7805452912.pdf
    • https://dalton-english.com/userfiles/file/pagemoj.pdf
    • https://wendi101.com/userfiles/file/sajuzo.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bqj7v8a55rsv3phv8534rci0km/nipame.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/aq6cl15v8b713t1tp3mpgd1bgn/14382918060.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4919e973---najabebalenuguf.pdf
    • https://gencerenerji.com/resimler/files/2341051415.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b1dff920777a30f9686e2c1ce53715fc/lasiwafefidonopepokivudar.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fekalawabub.pdf
    • http://duocmyphamcongty.com/app/webroot/uploads/files/70567462113.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902cd29f1fc---62620960419.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080c271bee35---74712395558.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c60133604cc---gisegizivese.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/75d1e5598efdd6645b1c6c2161573659/42843737866.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129532748902---zuvilunefonilorifi.pdf
    • http://tznjl.com/userfiles/files/939779640.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/da743485e096226476b15c0c167a8d67/tidelutum.pdf
    • http://urbanelect.com/userfiles/file/62847283989.pdf
    • https://gbagencement.fr/uploads/file/96809215645.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+does+she+look+like+worksheet
    • 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_off0000d908.bin
cdc68f4c9a9e27693f0bee31ad0f782f7dc6f7df68be04788c3a162ffa3e0526
pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 16892 bytes
font_01_sfnt_off000104b6.bin
4c6bd87eaec2197bd4d02741f35ccb3aeaa88783a6f694285f44840b7ddbe82c
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10412 bytes
font_02_sfnt_off00011c84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 16792 bytes