Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c94e9356da304c6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 00:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fd6003b5db0d267d49393425da228ca SHA-1: 3223ca97b953ac55c80a5436f00b2ba81d580976 SHA-256: 8c94e9356da304c61e9495e1324da8d47ff93aaa6f87b08e776034542a6d41f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://ellissi.org/userfiles/files/71163445231.pdf In PDF document text
    • https://artenika.pl/fck/file/25611397602.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/pozazimujefixedigo.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/2362898870.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/70236986205.pdfIn PDF document text
    • http://hadt.vn/upload/files/68613391339.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd877bda59---69431229929.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/bugofomamegemuzu.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/95538695603.pdfIn PDF document text
    • http://rapet.hu/files/kowivapogu.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/meximerelefopo.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/zejop.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/79292848649.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a108f669c6---gasufosujutixilabor.pdfIn PDF document text
    • http://farmina.ru/uploads/files/gabezofoxejif.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/82431332245.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/031fa43965949932d662f1d8e9305048/zitunolameva.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/rabup.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jfqk5lv9bt73k01gkq9mskd2ng/girimaguvexufiwozekeferin.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/4309105841.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/27606307535.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/mefugobok.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/60335378397.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/pikiwuv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137350198a1a---97855959272.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/govopame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+set+alarm+in+redmi+9+primePDF 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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 10796 bytes
SHA-256: 32b3709da4001aefb12e9064773927a0f58481d08a1bbd0f8fcb1fb301082995
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 17756 bytes
SHA-256: 38929b4bfaa4d4bd95c298f1b4d6360e454346986b62450dce4ea868c58fee72
font_02_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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