Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fbe5e812dbc433…

MALICIOUS

PDF

94.1 KB Created: 2021-08-12 10:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8d34d85fb84e0ae052d56438b99fee17 SHA-1: 4d71a98fbbd825826771f099c49e2f26e49578d2 SHA-256: 22fbe5e812dbc433cf4109a194f8c36f8b48c9fb945547668cbde92999b3655e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://chcial.ru/uplcv?utm_term=produce+101+season+1+sub+espa%C3%B1ol+cap+3 PDF link annotation
    • https://perfecthospital.net/FCKeditor/file/28274368765.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceff92672c7---polemidux.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/bevagiwinanabugoxatox.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/newajekukejerol.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/17334942288.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zunowigaboxavotibomi.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/12871532979.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/28b76a33e962da65f1f792f815c2360b/rakefeledimibobinos.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9fbndisg9hkq3skvl8rr8qi4j1/mabuwifudodujowigapux.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052121051870554.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/lomaverefexoluxovokozu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7ce28cc92e428d2473f0ba0cdfcdcbf6/55739402259.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/pesopenit.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/h7escc7d9se0k73dlpaji1sb1t/bipubekagaxodivodubesanul.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8hc9oo3nhiv9dl5g50r5qf71j1/vitututewumozafabumemefa.pdfIn PDF document text
    • https://mnlex.it/file/kekuvo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090672b05596---74209183112.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/rujuziji.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/foxewigezirugiget.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/30407714903.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/zizodibizevovupud.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a351ace84---48519030623.pdfIn PDF document text
    • https://heyratacademy.ir/file/65547670313.pdfIn PDF document text
    • https://ebooksweb.net/files/file/14970211918.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/webobumew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 18436 bytes
SHA-256: 525c61168b70dd6be7a4627f81b74fcd6452afaa365f2eb673f322115ecfd268
font_01_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001439f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439F 2044 bytes
SHA-256: 166647e4ca206401be642208a6cc3c1b45afdf5a5cda68b4cdff825ff866586a
font_03_sfnt_off00014cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF6 11108 bytes
SHA-256: 0752bcba374e97dc5d7a28c04c39fadf744493366674dc86997a12321cf71d72