Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fcee0f419a80fe…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 02:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dab6139e3a7ac2114dbab04bb025b0c1 SHA-1: 0e81d9950a07b225bb7930a66408c3a993ace7f8 SHA-256: f1fcee0f419a80fe1b4adf6cb71fee7c0a1a8fd2c3c11576c2799c2dc60deef0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=a+brief+history+of+time+free+pdf PDF link annotation
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/97308347305.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/105b63c7c9d7cfa3aed7fe0573e5c38d/tuxefasobafugixarepiretib.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/weguvolixejula.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/fokafoxelirif.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210903_141316.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/minuxib.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/25570789605.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/lunatopijen.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fac6d14d3---44841913673.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/totawukarutifevigamikeg.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/rujufawi.pdfIn PDF document text
    • http://18554080.com/userfiles/file/99016265497.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wajiterotomapesasubude.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/pasazog.pdfIn PDF document text
    • http://ecole.ru/text/images/file/rumetogopifop.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/tafafet.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/i5tgs718so1tp7ebiici1k65rs/88454043082.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/wubozubutujixivixobe.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66315123804.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613532da9eb35---bekedusizejotelonakep.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/dalifo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aab8ffae746fdd77cc73261d60169c70/51601418345.pdfIn PDF document text
    • https://eurotig.ro/file/wewapafudepasovujuxajet.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090207171854.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/maruvemiboz.pdfIn PDF document text
    • 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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 17880 bytes
SHA-256: 38ffa0be0637dc9e50d0c36f76ffef73b3ee67d81c27652f9350e4cc52a2ebde
font_01_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13409 10688 bytes
SHA-256: afe60fcee7a53bac0c5a902574853f15d42de1a9e176fd73a5c4f98e250a4ba0

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