Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33d164261fca7b4…

MALICIOUS

PDF

85.6 KB Created: 2021-08-17 15:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 23a04a17f0c9532ed258639b1a152190 SHA-1: 98aad44c4e70875c04f42f072f6839e6363b4ea7 SHA-256: b33d164261fca7b49121452300004371b17fb2dbf16680f13fb6c2b27c5b13df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress uploads and other domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h8h6v5hkdu3uujl4i27atkl6u4/25891177696.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/22ql4i7bbjbbfesrvm0adsl1r1/fewutu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/relimep.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1427e6ef66---sugomuzenopixolirewopa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620ac62b4b---59360817377.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6872df6c10d1f1978f24cb60830c7abe/83148063767.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-10/20210710082908610542.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab96b374aa---jojidevibutepujaxuridu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ffd44e75e---keboxinewipelufaworeva.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/58033605336.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/6465984943.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097e31876d3d---55582589630.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/36985081256.pdfIn PDF document text
    • http://dzbnf.com/upload/file///61416310040.pdfIn PDF document text
    • https://recrut.com/files/files/11410849134.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607713703c553---garesezaveb.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/49926282225.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/42788887234.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/86579472042.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23ba791910---4159379435.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8obacohhrbmd4f8tmn59bdaebe/59664195029.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/pejileferilusobutanomime.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/deeb3ae0d9c85c17438d94e3992a7a0f/kepefakupudopawubo.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/dipebisire.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/pugidezow.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16119596f8148b---sepijixegoxobidakezimup.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/69385438965.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/dafixibotajodabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=story+writing+picture+prompts+for+grade+6PDF 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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 16456 bytes
SHA-256: 3ad655bca4f323b4f91b7370e0103c24ce1862be3df0f3adb4baa5a3ec726a80
font_01_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 11460 bytes
SHA-256: f563a2196a21532407f10dba2356e5031bbefcdd45fb78faf9125d57958df40b

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