Malicious PDF — malware analysis report

Static analysis result for SHA-256 023e1e24654c308f…

MALICIOUS

PDF

82.8 KB Created: 2021-08-13 22:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99a0be181dbd1b303c6c95b1474085eb SHA-1: 9e16733fda5ca409c521115dcec20dd59d0e619d SHA-256: 023e1e24654c308f714b7fc13e65472bc594562ac4192de3be6f4ce82c73be13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, indicating a likely phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the presence of external links suggests an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://tramhuonghanoi.vn/upload/files/94837722059.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sfh1dsbos0h0kb4erka0h698q3/dasopadexunefed.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/tojarolanidutide.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5e79e309f---79772507360.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/66675227244.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210618052214.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeef75d194---kinobabovilodisovupegapug.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f11be0f50---gutimujo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161131f2a3f2c9---40782342273.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/o9jle12djn0k0p8oem5eitcm4s/dajozutinudubivaditaziv.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610b26cb0b802---295076454.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/verugudototironedujotub.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/15484762205.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/11297817802.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/32468369210.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/3707540922.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/14156634438.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f72d80a26---62118700349.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c211d80d6f---zebidana.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c939b87d8---jutopiwomowi.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/9715109888.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2d7e547788ac75a5c3a5af4afdf58e6/wejimul.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/84561430226.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/movibeme.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/sazefaruvoxedepigorunegex.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/mujudejefawojuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hill+climb+racing+para+elmas+benzin+hilesiPDF 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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 10792 bytes
SHA-256: e2bbc1d84479fbc5e6e336e3d5c3dff9516aeecea12869405e16e042d7c693a5
font_01_sfnt_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 20196 bytes
SHA-256: e8cfe813532b19a9c3d21485aa138887a98842ac2f3ae0b20eba670b623b8696
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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