Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc829e06f971d3b…

MALICIOUS

PDF

97.4 KB Created: 2021-07-27 13:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 53c4bf128c7ab63851dbc02c69e6ddcc SHA-1: 0c925323d393197673bf3b867fae2ef6eac82a14 SHA-256: 8dc829e06f971d3b30c90ba231ad319c5bbeffd6170ca363d5c3d5bcb069df0e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates social engineering by instructing the user to execute a command, likely to bypass macro restrictions. Several URLs were extracted, some pointing to compromised CMS uploads, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pensiuneavalentina.ro/app/webroot/file/34016484516.pdf In PDF document text
    • http://metabolit-plus.ru/files/file/34161060772.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f8ebce9b---kiwiforewujifelubonob.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4062077ed7---bolaveroseburezixefu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608388623cb28---rumawazexosutomig.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/63f038277b664cb82959fe8c725e1000/41438835534.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/86unpdrgup25ojbnh7qk9bno95/nutinapen.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/kedoniwulanapokad.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/71337967177.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/juwigatejadaruwi.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/ravosimujufutetug.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0vh2e2siedgqtcdl6ti214tgn2/49495857181.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed125f0b73c---wibipimuporuz.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c053607d2---68539665595.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0179db6ea---52268564478.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/952e2e984b0091d8ba8c7bdbe36f2ce5/rabobizizuvarapafuvarul.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/xupafatonejurata.pdfIn PDF document text
    • http://www.asslar.de/downloads/44948758433.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/35066754677.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085484db739a---62083294358.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210714115830130.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/bosisowipiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=windows+sql+server+2012+r2+evaluation+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 16964 bytes
SHA-256: 37d8cd06a4283be932befd1ce560ae68fb462a4b892b294c6c2f2346804fee18
font_02_sfnt_off00013c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7E 10928 bytes
SHA-256: ae57a2b4ff6b88a585bf39bcea6dd15bfa0c441a92ac2961b513e9e329d17275
font_03_sfnt_off000155d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D2 2728 bytes
SHA-256: d4768082f9a5bd3ebb76d9a64497f3363397ca030ad0f59199ee5f41d208255c
font_04_sfnt_off00016121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16121 16140 bytes
SHA-256: 2e40c969e06661a541bab8cef666ebc654a0d8416a3222ef5092975c876ce786

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