Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb84531e3844de2…

MALICIOUS

PDF

90.7 KB Created: 2021-09-18 20:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83451c00fe200a1d49cfe86c35add658 SHA-1: 5d7dc6c3d3d7dd353a17d1a310ec950b72e1d7fa SHA-256: 2cb84531e3844de2c0df17c4925cb07e7a355d5a4d93856138ad4b54d620f649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external websites, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://duepassidalcentro.it/userfiles/files/91555788284.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/859288ki34trml0ubkfme0im91/fozavegat.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/1701375620.pdfIn PDF document text
    • http://skomi.ru/img/files/file/81730907753.pdfIn PDF document text
    • http://travellerisland.com/files/nevelajoveniwegom.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/af704b58a8ed1621b03908dd276e3bd9/xedagilidito.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/pesezaletatarilobomefibek.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/68878743411.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/pifonawazujuwolali.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fipow.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/fewirepuzotabemup.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/86563935802.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/xafejumuxojir.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/fonumileti.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/24885000296.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f066342880---39746982714.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/56974050951.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/de7vka9d19ftepjtveqtkt3g8i/84035833518.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/49960703434.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/duvujamemevaxapat.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/pakojuva.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/7370212854.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/pexuliwimawafipil.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/37372792381.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/daramame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sailor+moon+crystal+eternal+full+moviePDF 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_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10852 bytes
SHA-256: d54b049953a9afd6f2d0009cbf8b3ed3d0928017fe96692a970b7253070fe3f7
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 21684 bytes
SHA-256: 35cd7594a15707e86f41dd6477490424e610958958dd2aed25170a685ae37ee3

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