Malicious PDF — malware analysis report

Static analysis result for SHA-256 59044bb204c8e290…

MALICIOUS

PDF

122.1 KB Created: 2021-06-10 05:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c2cc7624bd77c6e10239f35008b04390 SHA-1: a13a932d54c82104a832943baa879a5379ed5ae2 SHA-256: 59044bb204c8e290b3d2ae1bb200e677c925d06a360e0689cb39ef8204cd2866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9999

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://oniceh.ru/uplcv?utm_term=kannada+xxx+kathegalu PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/9c753d1f1252da9c6219c45ecd100625/83420171572.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e808927426---noladolelolazuzolezef.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7351e7f28---90906738119.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989fb21e78e---15103440751.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/qkk86vqrhrsba6sm3rfirb6ip2/zavazomuzodapamixo.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089285ff0aac---bupexiva.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dff771bb066fb02411ae245cd43d69db/baxururad.pdfIn PDF document text
    • http://apcmagon.com/userfiles/41950642562.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/45665365703.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8247675d54---42040251187.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e20e5acae---56687805572.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e0246b01be5e5baba7cf67099bdd8e5d/nuwezukumegilizigalixo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1ed06091575e982d897eb2a0a3e90a2d/faxaferafuseneroxa.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/46332993852.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999fc3b53d4---kijekenalavo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/84044569082.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015b55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B55 57208 bytes
SHA-256: 0666a48875d4105fa626d5003c7cad9297e4cbc1fcddffbf17b733a111d162ab
font_00_sfnt_off00014a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9D 4912 bytes
SHA-256: 70d61676d1ea8cd24b2cf9683dad56d7660706b4c176957328a951f8351ff74b
font_02_sfnt_off0001b4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4A9 10504 bytes
SHA-256: 9dae2a1780d1e4aef09bc9c3e97325a7b707891bcf51da86bb6c50485341eed5