Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfddc2f2521ce828…

MALICIOUS

PDF

78.4 KB Created: 2021-08-29 20:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f39dc7725be873f43e3111a002095734 SHA-1: 5df15821b74300f764b6b9b2c3ab00fa5f42fe32 SHA-256: dfddc2f2521ce82889cba33abeb697e07e078a5a8cce739bb543f6b25fd9a405
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://markyatirim.com/resimler/files/gumobojasosidibizojezete.pdf
    • http://decamiones.com/userfiles/file/bemejetow.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e885638d---87640882529.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97f912450---87351053103.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/175090873c8d6542abd4a18234aff57f/sareravufowelefevafa.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/45499336159.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd311c04c---14411646951.pdf
    • http://ever-pioneer.com/upload/files/jowobudapubaxokoroneb.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813fa74e25---31531315842.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90088330670.pdf
    • http://scbczy.cn/up_files/file/20210605_191950.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9281ad04---43248304893.pdf
    • https://bwawarszawa.pl/upload/file/xafuginemekavovu.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d563a706687427be80aa01006df3fddc/93311479894.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa4c5c868---66970851397.pdf
    • https://peperita.it/writable/public/userfiles/file/vifipim.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd62140fe---tuzinigur.pdf
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/sufefo.pdf
    • http://goodmix-psc.com/userfiles/files/zegagijaxu.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976d2bde673---56071121131.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1e2f12e9b---fosofaj.pdf
    • https://frpeteradeyemi.com/userfiles/files/zibagipowuxugepinupibew.pdf
    • http://feg.vn/uploads/files/zenosoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+world+is+gonna+roll+me
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76ff3cf23c---97980267680.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd6.bin
f89887bd9c42ffb11ef76a6414a9097a2eda8ae350c03e7a102e6aeb0b2a7e2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 18300 bytes
font_01_sfnt_off0000fbe7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16792 bytes
font_02_sfnt_off000113fe.bin
1b0eeea9c158da0415ad5010db343352fcaae88bd9ab759188423e19c3d61878
pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 10648 bytes