Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d42014e70b3db7d…

MALICIOUS

PDF

95.7 KB Created: 2021-06-27 11:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca05c53ad02adb4336aeba8693150403 SHA-1: d4c62bd6a9657957b8f13902ee3eaaab3582d940 SHA-256: 5d42014e70b3db7d6598b8d9e5e1f8d42986e91c8f7f04f2bcc7472d74dba503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, with many URLs pointing to compromised CMS upload directories. These links likely serve as a lure to download malicious payloads or engage in phishing, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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 https://irlanc.ru/uplcv?utm_term=bacon+and+onion+pudding
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cea8f4de---914694551.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1c110557---wawujidedutasadefijukobu.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607843486cb4d---zerimapewabokefejetepuve.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/rasopufi.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a163a923779efc531d55d864eeec64c3/xalowoturedikefumozosipov.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/farimiposuvafeda.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/sumotezabikatan.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/41b526ffb2f1d021685763e85f8659ea/13221056005.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/tusatef.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0db2267c1888121566d4c7e19be6e2f5/11556216949.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812fb6c689b---55179360890.pdf
    • http://yokohama-model.com/userfiles/files/87167356686.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/t4hvqcq4eebo52ogfpnn2k1kuv/92020847209.pdf
    • http://asbazainville.org/userfiles/file/xobexoxavetisenurinas.pdf
    • http://hitecds.com/userfiles/file/93287266839.pdf
    • https://auto-rujo.com/images-editor/file/zanap.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ed926af4---38691511194.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed8312faf9---45629090620.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca104b3933f---jonuwulogogewapovitexuz.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b90850ba2---52103639168.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hrjndprikjf1usm798jio708m4/40097492229.pdf
    • http://przedszkolenisko.pl/userfiles/file/94072036865.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a844de66d9f---12027782041.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ea710642---41287375605.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/314f2e786d1b02c6134523822d18c63d/sifugel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedd.bin
5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 16684 bytes
font_01_sfnt_off00010676.bin
9d4061ba87912f26b329f4ea7347756d5bd979c8f26355bb4ca3e859106f8507		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 18628 bytes
font_02_sfnt_off00013737.bin
d834dd69d27b95d227c0d2f391d1db95d352d46c12ed88e6d7363355ec8ea671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13737 10300 bytes
font_03_sfnt_off00014e45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 16792 bytes
font_04_sfnt_off00016652.bin
065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16652 1824 bytes

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