Malicious PDF — malware analysis report

Static analysis result for SHA-256 723f670206ca6454…

MALICIOUS

PDF

93.5 KB Created: 2021-09-13 01:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34dbb77332b99599c4cdc5615fd94db1 SHA-1: 9039b268e6803a3c217ac437fae592313df3878a SHA-256: 723f670206ca6454c0bec61e650ec44625b5865a39931f38e875daf8ac9a012e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sangjeom.com/userfiles/file///surakaxabudufonuja.pdf In PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/55408323201.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161335fe3828da---fupetivisixedar.pdfIn PDF document text
    • https://harmony.im/userfiles/file/18653680377.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/kefopaxanuzex.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/kegobiridenavozu.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/31512804716.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/38752432747.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/ferigepa.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/f9d4b724fca8d0ccee3eb1a967f4e056.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/vegadudorabukadu.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/68738464909.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/parokexiza.pdfIn PDF document text
    • https://kueapem.com/contents/files/zolipubabupanerovobo.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/79215539947.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/51781469241.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kanadobogojikelej.pdfIn PDF document text
    • http://coolscape.info/images/files/nopijogakijitivowaja.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a67472ef---61630514540.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/zurezufoxuzisofibumeda.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p7l4fjrdpgn9de4edfv6i3mop0/puxitobejezuwatofozaxifo.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/24775582999.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a056fd7583---darose.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/lopawizorunavinebamevom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=clash+royale+working+free+gem+generator+no+human+verificationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 11272 bytes
SHA-256: 0971562aab90ad10d4e041e0944f6191b589e2cb1aab113383d2a1c17b37e3f2
font_01_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 18512 bytes
SHA-256: e6fbb8efbd52721dc44d52c4d6234b63b5f83c6c85f2256ce40f2f3381836efa