Malicious PDF — malware analysis report

Static analysis result for SHA-256 714432125691cdcd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 02:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b82f4318cfdf427347ede2bab11eb3a SHA-1: 5c501a970eadb78443347c969fbb2accd48b8f9b SHA-256: 714432125691cdcdfb413e7ec1d5f43ac660b2a9aee95386b764f648c8669cc6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and disposable hosting detected. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, such as http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613083a1eaf0f---dafusemasetonepi.pdf, likely serve as lures to direct users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://agedwedfjtj.pretty-match.com/upload/files/17556119250.pdf In PDF document text
    • http://tourister.kr/userfiles/file/toxatezoxidoxofonaxusari.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/38124681775.pdfIn PDF document text
    • http://sun-tes.ru/files/file/sugufugosatojajikat.pdfIn PDF document text
    • https://suruburi.net/mm/file/16616622464.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/93300634757.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613083a1eaf0f---dafusemasetonepi.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/kivotuwojub.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/kuseponakavemulexazimiru.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/wajilimajosupujalun.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/85936412685.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/avc9oi8lc5l5v08h1irp8qo2l4/98925899784.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/96948941295.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/63779571989.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/lugukuropuxa.pdfIn PDF document text
    • https://norservis.cz/files/files/25832984058.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/6143426729.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/26697557433.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/82176705078.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/bajarujamugo.pdfIn PDF document text
    • https://digireg.cz/upload/zudafuxododevoriro.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/45348854590.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/93391061405.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/razar.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/89975677364.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e8a1a4ab---wurigajuvavev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=website+to+watch+bollywood+moviesPDF 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_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 10832 bytes
SHA-256: aaa7166755fce9230b8f5bae446c648916d606f8b36a86850c25fe64ca63b86b
font_01_sfnt_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 17612 bytes
SHA-256: 7b799300ddd7f7384e2a1d6abe958bf39f20a2daf6b02a417fabf30cc81ed9bf
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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