Malicious PDF — malware analysis report

Static analysis result for SHA-256 a118a55fa3cd8d52…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 17:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8e838318ce0bf9b3a4e8f3684d60e43 SHA-1: b4a40b0d191e3f08f23364674857cc242544729a SHA-256: a118a55fa3cd8d52cc1625049317d92f35f8030f44da81429e1055e99adc6e06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress sites and other disposable hosting domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection strongly indicate a malicious intent to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://35ct1.com/images/ckImageFiles/files/fokapav.pdf In PDF document text
    • https://nbtele.com/en/cache/fck_files/file/jalasovegarufovaxe.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/04c81542b0d849141f5b81dcbde48e99/62716387598.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/an4vtloadfog2g9rql77am0aj4/89476495093.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/60719716271.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/47856657443.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5831f3a6a---36409680937.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b30b215d0---pimoda.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160876e685d999---siginazuwa.pdfIn PDF document text
    • http://tianfonmm.com/d/files/81962984740.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aafab1568---8160088714.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba5b3e01e---wapiguvosavinojoxabamez.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051508051753.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/wosuwamedenevulalukuzi.pdfIn PDF document text
    • http://generoussecurity.com/uploads/lilomu.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/silimujuwobile.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/68772456768.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/ribosatededuzajozuzizip.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dijoforuwonupadew.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c30f99a41c01e25b57f8f7daedb8c70f/56330487328.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-11/20210811055711623642.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/9137527538.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/10484782507.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/38887929683.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046cf9d52c3---91195160838.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/p7rfl60lm4kav91ta01v3jhqi3/71028226315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=compound+and+complex+sentences+worksheet+grade+5PDF 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_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 11416 bytes
SHA-256: 07f0679ced0ec92fedec64fa15bebb98d46664652681e98b02a42df03c1e8a42
font_01_sfnt_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 17476 bytes
SHA-256: 5dfae726670b9780941cc39616964e52b6936151051a61160308cfd8cd703ce2
font_02_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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