Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5039c0b2d8c2cb3…

MALICIOUS

PDF

71.5 KB Created: 2021-10-03 07:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed9ec91c6d75d71cedbdc1af51afc7f6 SHA-1: e0cfedc703016147fb2bbfd53c9f2bc628ade5bb SHA-256: b5039c0b2d8c2cb3936d05c6a99368875a93c5fddbdea057875e5f85f272d4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=chris+guardians+of+the+galaxy PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151770c0dc10---jurakevibo.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/71466466605.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/pomaxo.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/mujilapalogapag.pdfIn PDF document text
    • http://rayanchem.com/d/files/wupetiduto.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pekezezivasosap.pdfIn PDF document text
    • http://konberdbio.com/upload/files/bilobumapuvaxunimefuta.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vosizegevubulipa.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/77686889547.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/jutosevotemakewakori.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/95326416638.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/temijimibilasuxerokuzije.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/35840008703.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6f31fe614eaec3491996b87a154ce66a/dakeguvurotij.pdfIn PDF document text
    • http://itena.si/uporabnik/file/biwojanetaz.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/fuxeximegibubuzuxidote.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/winotepunivow.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/jupufosanuwenine.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/batutituzewuterinu.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/5327756817.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/radebitegotomubuwikod.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614baa0d5e81e---rewopukonosaf.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/jatozonomadovu.pdfIn PDF document text
    • http://3sdent.com/upload/files/57374850217.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/muradukoluzuxafadebexi.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_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 16564 bytes
SHA-256: 0d46a60daf408f3953623556d89b9fb2cd4a4eaac335868c0e87776b6f601b55
font_01_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 10980 bytes
SHA-256: 8eeab705d8bed0f48e2e163d5cb8c43cda6bd3870257f91fd81dc2145e877074

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