Malicious PDF — malware analysis report

Static analysis result for SHA-256 197adff4dee6df47…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 01:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dc274a1e5ff34a5b7ba1b6bc79a83ff SHA-1: bb15c0b9f5b5cfa945163aef7d9e2cf60c8c1941 SHA-256: 197adff4dee6df4730551ae82de67eebaf9f8ec87a759463483c8514c467c3b4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, likely to lure users to phishing or malware distribution sites. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/938155678a4b0b0eaf7f5671d9e0d727/82074642205.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131be01d34d5---betometuvinegetesudisune.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/13304206844.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613259bb47e93---57890503950.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/tesijur.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/sosutesedelomutupax.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db45a9efaa---74318138650.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/58597338457.pdfIn PDF document text
    • http://upakuika.com/img/file/77430635231.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/38908766750.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/pajobetuj.pdfIn PDF document text
    • http://lex.tj/img/file/beditodepol.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/sagutodojisavix.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/roxunuwakesimawe.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/83075283267.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143bdfc94a84---62399199492.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/dumoruwazud.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/fojefepamisitosazesoxo.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/36127853630.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/robamepobudepupazuwiw.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zeparuletarobul.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/9453289933.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141627d3c16f---japedomozofumujabewor.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/lovazisuvad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watchonlinemovies+com+pk+2019PDF 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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 11152 bytes
SHA-256: 6ae23f94b438f8cd0fab2dd5b441661524319dbeafd1c64e55caebe4a1e1838b
font_01_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 19260 bytes
SHA-256: f687a3104f0ada67c6555e41cb05ddaca2325b2c533c148ac6916a27c5df6f63

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