Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1e423d9b3be912…

MALICIOUS

PDF

89.2 KB Created: 2021-07-13 18:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 91a8794c621b19c8b62d1decc051321d SHA-1: 60359118d666171a9a56b7d8df4cd47141a056d8 SHA-256: fc1e423d9b3be9123908e4c049a99f87973e7bb447199c643459aa36474b95cf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on compromised CMS upload directories and domains with suspicious subdirectories suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://turismo-galicia.es/ckfinder/userfiles/files/57306816831.pdf In PDF document text
    • http://buydecor.ru/uploads/files/59047108028.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/31cb3eadb74efdaa4a4ea2fe16602087/kejudumanisopubal.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/nusaguxetin.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/70067187505.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/9691088640.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/meromerigajusonogew.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa37d5e742---fifuseluvitilufejex.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4b62a8487200e3907b6d34887e88d57/nibiregevaxafusowejowar.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4c576b8d---26911200163.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/53494444379.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a66ea0f6---97390269456.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/bolimogudolabuxolavoziden.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/37550441963.pdfIn PDF document text
    • https://promise-land.com/upload/file/34120880729.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fifipiwelana.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086fb4385272---bakakegugijukugulaxuwix.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/zezedosinudubavalazediz.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/xijomosajawegibokirara.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba47ec5224---wadixek.pdfIn PDF document text
    • http://benly-carson.com/product/files/rogisedototisal.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/q5ra46s95grqbf5o40q0gvv8d0/92169440781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=psychology+class+11+chapter+1+notes+pdfPDF 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_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10972 bytes
SHA-256: bbea641d3a297ff499b16fdb1770cc94129e59c51b3f2b15bbbf6079a1adc89d
font_01_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 17704 bytes
SHA-256: e6b2650ad90ee522c45a9066ae56ecc1299bde80bbf3d22a97024cccb2c1fc9d
font_02_sfnt_off00013fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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