Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6008620480a9e1a…

MALICIOUS

PDF

104.3 KB Created: 2021-06-27 01:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6385aeb52d0c049f1048c801d00c896f SHA-1: 5a820e3d43a2c5d3db03d56a3eb17000349d8bea SHA-256: c6008620480a9e1abe5e18288ea367107bfd602443668d6e7e6e15eed9ea71b2
196 Risk Score

Malware Insights

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

The PDF contains a 'Browser extension / update installation lure' heuristic, indicating a social-engineering tactic to prompt the user to install malicious software. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download and execute further malicious content, potentially exploiting vulnerabilities or delivering a payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://discoverthesky.it/file/sofowani.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d382ea05ce7cf7524dbf4fbd74f47753/78828323764.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834c7482611---rodabixumunuse.pdf
    • http://cuacuontoanthang.com/media/file/kasisobawib.pdf
    • https://secolink.sk/userfiles/file/purakiwabupobivezuzebi.pdf
    • http://manixcnc.com/ckupload/files/durumijosorovuvagaledag.pdf
    • http://bawaconstructions.com/editorData/file/11745363874.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/81014721868.pdf
    • https://hagepoorter.be/files/files/40636495142.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/eed2c463a1c9c7e1d73dbe4c5e183708/sogajufutozedaxopeda.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dc2e529dd4be50653f9ac8299f3561a/13422732348.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f84f6a471---jopawep.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/apufl08l8jri7kthubaoiu9h80/62364370732.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/fulakenujara.pdf
    • https://aravlicraft.com/cmsCart//upload/file/2841320998.pdf
    • http://www.aadhar-interior.com/userfiles/file/jajaguwikuxok.pdf
    • https://auto826.com/uploads/files/lefoxolapegijebotesoveg.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd9c69ae4---baluwizizanovoneweximob.pdf
    • https://walkandsmile.com/userfiles/file/73393975674.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/6ssqf0huh31rf96ar6h3qp1g5e/18897023320.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5c9bfe77---dozonojag.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502185900431520.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e087398b---66248590171.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609a667c08b18---9207149060.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=learn+ionic+4+from+scratch+pdf
    • 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_off0001316b.bin
26a909e3ba4eede2fd8903dbbba2a1a796a01005e3892df200d3a42c6a909529
pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 18580 bytes
font_01_sfnt_off000162e9.bin
f6ad46813d9695e88ac46c5fdf4f6cb93fd9db78dc9f0afc530b6cb79fbad902
pdf-font-stream PDF embedded font (sfnt) at offset 0x162E9 10876 bytes
font_02_sfnt_off00017be2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE2 16792 bytes