Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0aa907fdda002e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 18:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db8f3970f7df55e8f10283fd8b1278b2 SHA-1: 423a3ebd22a10a8781cf75c5351f0f0b91b426ac SHA-256: ef0aa907fdda002e6d04758adbf5103cddc1cdc23b204f54638ac399b03669e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The presence of external URIs, particularly one with a 'utm_term' parameter suggesting a phishing lure, points towards an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://irlanc.ru/uplcv?utm_term=motor+manual+honda+2019 PDF link annotation
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a794905c904---55260304299.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3384c76bc---robevawa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/15474914185.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/zojakoravixabef.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/20764180057.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/45462629071.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe23db493---tegorikasu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161157fb00b751---puwunusovun.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16127663187bc2---rarapebepuzivumanimam.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/59859869300.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9da7b5ca---22818193146.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/dorofugigip.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gafafegamosunonelirube.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/84321513589.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/30f4o0qnuqte40kq7e3csafme4/90586152938.pdfIn PDF document text
    • http://valeneighbors.com/userimages/zeleduxaval.pdfIn PDF document text
    • http://malifer.hu/upload/file/bovapibujipozonisajefu.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/kininewumu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c1eae017---13248014424.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/83495501796.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/folabejenikowigebidigaz.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/82145939720.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/sv2002i06qgoc90nvu8tp06biq/mibepawul.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/3787a240d80ff48ace1ee6b944a664fd/bovoganiveliziwefonuzapus.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/nujip.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/b3e23bbc0d54cbc1190eccd6f1b82ac4/merebefasariraginuweku.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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 10676 bytes
SHA-256: 55e447f9b98762024b98d1039acbcef4b203dd6768195e4db934eff77c5adb3c
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 18120 bytes
SHA-256: 1511f6b841d916aa8cfd64f272365841e33d4fd5f3812bb3933f09bff2a0d73c

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