Malicious PDF — malware analysis report

Static analysis result for SHA-256 24880f8e60520559…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 14:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90bcbde69a5e1cc3e76b41f5d02e0d42 SHA-1: 7fdc4372682c109dc6383f43a9f948263ce41ab9 SHA-256: 24880f8e60520559efc4b46c9c4493694606ef8d6ea3c6c8b5ef9669c9cbcf42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of external URIs and link farms indicates a distribution mechanism designed to obscure the ultimate payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=dirt+bike+unchained+cheat+codes PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10852e012---turobiwenizuvobu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/63719000489.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/61482633656.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/70560365599.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/figivuwis.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/60140165345.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/3anc767or4nmm7abhcjv5mba65/beduwigasiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab7635ba9---natuvojugesiv.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83f922f15---kezerijegoxosu.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/duwesomipusudowu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da2906ad329---75413750937.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29267520387.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7399b1e021---tifof.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/peporawi.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/87612865994.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/48frqvu3she7m4jvtdeif97ipg/jesoxijoregotelipugijewa.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/49ac3f2e0e8eaf582ade82d136220832/jemokosu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16cddad1a6---kupamoxofiwotaguni.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/rilewobofumebotujozir.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/navomukomelefot.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/zoreminuvigugoturenipurob.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/26635478130.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pefikuxegu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xijijepipuvobiri.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_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 10752 bytes
SHA-256: e0e8eb43ebfc4dd8da1a48e4d2fd159265ce04ac7635e2434bd6abb4d950e6ac
font_01_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 16684 bytes
SHA-256: 0242e396514615cee5acced789bc63209652036d921c05ec45d7042f7269fc58

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