Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c16956abdaeb30b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 08:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 792c2d9f3304143299ac2dec529b97ab SHA-1: 5f73238f672bbffff03fe0b4271c5b77e20c52bf SHA-256: 5c16956abdaeb30bd1da4405f921c39cefa507444a08c546e06f4e842d29a6ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious phishing document, including a compromised CMS upload link farm and a ML classifier flagging it as malicious. The presence of external URIs and a visual download button lure suggests an attempt to trick the user into downloading further malicious content. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=cinema+apk+android+box PDF link annotation
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f7d5fcbd27535740b53d414bb0c35478/bojuxewidexotek.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/pidukaxepobojefuvakuseva.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/56833809193.pdfIn PDF document text
    • https://semut73.com/contents/files/68636792901.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/39207156271.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/18406821655.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wudagufusod.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/ruwap.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/56703476039.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/febegamivupebitolovajuku.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/xukoxugodolapefikap.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/nutujinisugijimuxara.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/pijovol.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/baeff06ca81a1de830bb92e9b6fa3a3c/gagulewimutuxobadesalado.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/62923332737.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/nodumulafezorakilotajorab.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130046669408---lunepowazupa.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/tanofufokibonetanebo.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/kufesenasogesoro.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/98837740634.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/limarazafujaz.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/vagovefezetigipifitazu.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/getasa.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/libini.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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 18344 bytes
SHA-256: 334eb99ea59a272fd52521b8408ac9c7ef9f91cb5378ba0a99e4ba25faacb122
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 10604 bytes
SHA-256: ab064113870af277cc05e0bdb192e364ac5e1875fc91164ab7931925565c17cf

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