Malicious PDF — malware analysis report

Static analysis result for SHA-256 e605c310b974be3b…

MALICIOUS

PDF

95.5 KB Created: 2021-08-15 04:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de9fc31aac18a6bfcd90cf91171bf20c SHA-1: 7ee20d835bf66a00e070cb8c616ee408dbf3dabc SHA-256: e605c310b974be3b9b1f8e0f4d4210e92b6082140cb2a3cce925154c19add4b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and compromised CMS upload links, and a high ML score. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution campaign. The embedded URLs point to external sites, likely serving as lures or download locations for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=multiplication+and+division+word+problems+year+4+pdf PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b53e8f4c6---jakesofutanelusinoj.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7lit7632nohrntuul7ojmsmpo7/welemepubinejavekalelu.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/suripafepivivavut.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c950a0f0e0b---waluzugarepina.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/50892047849.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/genog.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8c6f9c63c---14921395879.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab76ade21---16031492639.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/83630829898.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/32583302031.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/venex.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/fixep.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/v8vr9i3eoqm2n36t41m16421ht/54521503850.pdfIn PDF document text
    • https://ijpdua.com/contents//files/64984722842.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de0680ab9---gobibebilulevinudadade.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/a21689306de93f1b8e1ea34fe0333c80/zaduporojigowaxaxuweliv.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/25693999535.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/mefofubegadazelaju.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/ditogam.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/68cfivp85f4dd1nk2rt9pt0rt4/jimufo.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lovafagewipijixaba.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108f19950ee2---94627584124.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_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 17332 bytes
SHA-256: 17aec5b9cb0365ff499f043317e10230dce3fc591aceaec3f17ad0ca3b5849cf
font_01_sfnt_off00013a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 11356 bytes
SHA-256: 9b239bdb4cbded84e46a2dbf87b8ff9bb4a74ba23c0132b0c933436bf23478d4
font_02_sfnt_off00015501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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