Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4c0b0ca6610c3d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 91efacfb31d3fbab2895e992317cd2dd SHA-1: 4f32d3ee5ba82f6355a18e13ce63f30709c81dda SHA-256: 9a4c0b0ca6610c3d9b6e3e28278a2e58d6bffece433a606d7aaea0ca2e930e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

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://synerhu.ru/uplcv?utm_term=kof+98+android+download PDF link annotation
    • http://ficfart.org/userfiles/file/25160207418.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/29197645430.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/56136423780.pdfIn PDF document text
    • https://bak.vn/upload/files/nunomigezubifurilaroleke.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/15221443631.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/kawivobakotijunarisakow.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/16372249516130af267ab2b.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613762cd6141d---nolekokemovile.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/jubixusite.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/36423851974.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/vozidoximetolet.pdfIn PDF document text
    • https://clove7.com/userfiles/file/pifefetarinafusitonaxezo.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/88016170073.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50604802886.pdfIn PDF document text
    • http://thaide.org/userfiles/file/niwalumatadudijofu.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/gobuve.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efafdc0d02---9382771777.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/52563511064.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/56934493647.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092403374873.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/30562556622.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/20156137405.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a3704881381b52b714557f74dad8deee/83922553422.pdfIn PDF document text
    • 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_off0000ae91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A8 10404 bytes
SHA-256: 5a203c3c25021f4fdf2bb0a1a81f9266897fa025e7fe440df4d4c896eb57f73c
font_02_sfnt_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 15436 bytes
SHA-256: 6dd3fbd037e6e2efa5a3b00eba9e83d209d5f0fcc65d42c81bbf4c5383ed8870