Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e01130b8aabb85…

MALICIOUS

PDF

96.3 KB Created: 2021-08-09 00:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f74c9bdc21fde4b19c1cb86e8223758 SHA-1: d87c65ac5acd48eff123baffdf8695a395e3ec82 SHA-256: b2e01130b8aabb85d311c586855a04a8e63a5161fbcd6ddf355821ec33ee6413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised WordPress installations. The primary attack pattern involves luring users to these sites, which likely host phishing content or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/uplcv?utm_term=simple+compound+and+complex+sentences+examples+in+hindi PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e427ebef759---zaginobut.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da8cbc68375---jatunalopipo.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/maduzalazadokanulezoxu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8e16eb52---47975566295.pdfIn PDF document text
    • http://canoeing.by/pics/files/13746592253.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/51793353663.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/19780305715.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b067c1d0b2e53d56877571e76ca3d202/vebadi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b73a37e70---77165783837.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/74696724316.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/nomotiradiwob.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7a6343c8---56341547392.pdfIn PDF document text
    • https://avenue102.com/uploads/file/42616264248.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/39dc1e03b57b6b5a471310aac0248879/24582879781.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2hvdem1njpqrg049nd805i1196/dasoxisotefutaf.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/aa4b3da81e3e8e3eb3196c1bb0951dfd/gurunu.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/60139802314.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f7f3cfa12---71609899744.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c00fbf7e669---29916750176.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe93e61913---73599653811.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db42a762ceb---38121571818.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/76479725445.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/79885742504.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/22511589788.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ncoafm0p0dl8ah5hks99fmpslf/54893967073.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_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 10956 bytes
SHA-256: 534ea27c43a2fa0a2bf88c5b206d3e6cd32cd74bff0ba2c0db9e7e2754cf64ab
font_01_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 17268 bytes
SHA-256: b1f40af84f8e091a24c3252793b7b5b57f3aa6df2f5a1cde5da44b29fd6427fc
font_02_sfnt_off00015a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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