Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eba92e212f9c71…

MALICIOUS

PDF

93.6 KB Created: 2021-09-05 01:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f0acae54f09816f6905f27f63ff8e67 SHA-1: 747e5f8ba9e43a11224d571b7a953099a250fbcc SHA-256: b4eba92e212f9c71b7842a7d16258be4a66fbc71df67630a0b7721e26f6685be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The PDF structure and embedded links suggest an attempt to lure users to external resources, which is a common tactic for phishing or malware delivery. No scripts were extracted, but the PDF's nature as a link farm is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://boxethai38.com/upload/file/jototexevapit.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/npn700ku7af39r344hjim968l0/58295570796.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce269c2db---xavasujur.pdfIn PDF document text
    • https://pindimana.in/uploads/file/24531647807.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c4654632---gawajolutuburagete.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210721014730.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hucscdv5030jfc38ddviaca32r/susiribolamavidinopis.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34858b62---37777597838.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609effaaca7d6---46071822611.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/99772008886.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/jivemogamos.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/98579128713.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/26339531912.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/dexixo.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/64743934874.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9368e9fbeb---bigaruxapovus.pdfIn PDF document text
    • http://policylic.com/uploads/files/jumefuxesabur.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/dukisitotugosegox.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/kasapilalef.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/cb8940m60egnuvtp6nibkjoj21/wofojekamebi.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a82d1d4df45---75481402299.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95e1a778c---mukakirasefamedevuwit.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/8891591196.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/74009050882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=into+the+wild+pdf+erin+hunterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 18700 bytes
SHA-256: ec43f944c00bb5e899038ae3b9fcf31e26b1d11e5d0042a804a0d51963980526
font_02_sfnt_off00015174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15174 10404 bytes
SHA-256: ed305f9aa438d27dd02e36fe1b8e234e0ffd4c3577cfd53a472c62a35733c3ff

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