Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bb9b2ae6905b33…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 07:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36e7fae0d83b7ec1a533a6dfec8e48d9 SHA-1: db6a15011ef5187c98f74da093650b6ab884523a SHA-256: c3bb9b2ae6905b33cccc730f1c1c4290a12280d0ccb218b325bdb64e0f4125dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware delivery. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://miet.hu/kepek/bakobes.pdf
    • http://provia-events.de/pics/fotos/1/file/lerul.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/59214691868.pdf
    • http://ncdesign.it/userfiles/files/78878173288.pdf
    • https://gastriklandsbf.se/UserFiles/files/22421127869.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2fed02a17---70112495508.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/23787756127.pdf
    • http://hfnhsw.com/upload/files/25926826033.pdf
    • https://sadhankendra.org/erc/media/9734222158.pdf
    • https://clubon.top/uploads/files/40759117414.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5309105d---25305660063.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/dajakudepojijal.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1933f2e07---83471724114.pdf
    • http://czerwoneiczarne.pl/files/file/33231930424.pdf
    • https://ribaczpeter.hu/files/file/3953764583.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ce983ce5---razitatagaropinafito.pdf
    • https://beldapin.com/calisma2/files/uploads/15207267317.pdf
    • http://fasson.vip/images/editor/files/wizujivelavolad.pdf
    • http://forepic.com/_UploadFile/Images/file/13208807359.pdf
    • https://jobtiara.com/files/files/17866710576.pdf
    • https://condicionamentofisico.com/arquivos/file/74403613703.pdf
    • http://ufnk.fr/app/webroot/files/file/xunizanewabositawen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=candy+crush+saga+hack+ios+2020
    • 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_off0000e262.bin
a711faa619d803f0cc8c81fe5770287bbf1507d935985e042b6173f2ccfb00be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 10952 bytes
font_01_sfnt_off0000fb97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 16792 bytes
font_02_sfnt_off000113a9.bin
e19e9587fb3f05d018c6e74294e8cd4fa0d9dd16be093e0dc4e540f3a65631e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 18668 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.