Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec6aaec71649341…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 09:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63ea954c1f2768a15d4fcfed9c46c061 SHA-1: 36b5c096a33e4b096b3d93bad981945a00595365 SHA-256: 5ec6aaec71649341bd21dbff78077f489838cbc21f94ea6db62711cd5c21e416
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of multiple suspicious URLs strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/318cb86cd8bd2269697a3542fe3b5585/11693648988.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/8b67f6e9b20c731ff75b2083080ae3f5/87323079150.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/9137527538.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/sapiluxuwagilevax.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wotamuwazabelika.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/81b69e98c8c8c124f64d510864c390bb/27859251989.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/tefitifewusebimunovaduxu.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/15711037257.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wejadotepivujipox.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3118363b9e---82812509143.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e7bd90036---64868445847.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/16342663077.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/97822306409.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/297e286dc014a19d5a2577d3c3f299fc/73623926375.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bukavisisageximejiwejiraw.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/83e8b6252c3163e6b57c89e011ab66c2/25630416458.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/79793922494.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/95362790731.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086032869bd4---kubuwikibigovorutovom.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/wukofune.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/jikabixafunofera.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/3821602375.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/pazovosidagufitogo.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/56799630225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=husky+air+compressor+8+gallon+manualPDF 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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 16808 bytes
SHA-256: 4ff5bdc6c9dbfd880952be676fd6745f859e230aa18eb5ef89031a6050ce312c
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 11124 bytes
SHA-256: 77f8f4d777ccae6446909a453fb49b40308019a24ec51e7bc153e0fc403886b5

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