Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62d4557eba52f62…

MALICIOUS

PDF

103.6 KB Created: 2021-07-16 19:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5c5fd750c796a0cf23e3cbbaab11285 SHA-1: ce8acfbffc77b2e64ad5ed5498d14bc4fb8c6b9d SHA-256: e62d4557eba52f6275e793169539cab3ea4f8630cec58672382db4b7a4814d22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://portalcom-b2b.es/img/user///file/_0495654001622008059.pdf In PDF document text
    • http://omonetach.pl/foto/ilustracje/file/18512019486.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a327d5bc---40694977020.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071303202773499.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/tululokaxekudarogoxesotis.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/25589151040.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/lesixu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f59eabdc---17047479694.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/73244865786.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2be110ee4af82c9a5d9bc1e6204566b4/9986867687.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/34678232052.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gopan.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fbd254158---vojakifuzofosovom.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/64643347759.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2f0d65423806ece2b40c83368b6455be/gimozinaxomaxiver.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/gnh56478h4gvn56op2l7j19ll3/tijivofewusotukulabu.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/kodifiviwedozixulavilop.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0babb9oj35r0anh80pks609udb/gogatizafibibulejin.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/82953023644.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/mapura.pdfIn PDF document text
    • https://elektrona.cz/files/file/69666814455.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/dupexefometekexi.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/pifewejuseragun.pdfIn PDF document text
    • https://asi-filter.pl/files/file/pewabivewelaruj.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/45c042d03092d35fe8cd0fe63b81d3e5/wuxinututes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rational+equations+always+have+extraneous+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 10864 bytes
SHA-256: 44b669757f3e862797cdd8d6c411fd1db8a2902eb774a053e57d20bfe6f4666a
font_01_sfnt_off00012fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DC 18368 bytes
SHA-256: 7dd93c84cd9248ddb64ffc5a58a346487d0abb792f4ae6f3f406d870888c1699
font_03_sfnt_off000177f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F5 16348 bytes
SHA-256: f2b04fa57bd472238a9abe18ca68f80992fbfe74bfa3f5f6e132e685f126a8fb

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