Malicious PDF — malware analysis report

Static analysis result for SHA-256 355c74e4787dd105…

MALICIOUS

PDF

91.2 KB Created: 2021-07-31 23:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc58e450729319403ef9785acc537ec5 SHA-1: 354c82b1798aef06300820871b7860f31d6c3c89 SHA-256: 355c74e4787dd105019a57f436d09b27f3bfbd1fc1c435292391f07f6a98f43a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' lure further supports this, suggesting the document aims to trick users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/uplcv?utm_term=idle+heroes+private+server+apk+download PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6568e68c3a2887882278343c61dcbe0c/lagote.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/61828382323.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/povuvositodapozo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988cadc9a5---lexejevidunorakofawuzi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c223815ba8---85418946113.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2362c82ec---xidavawezugegimoromi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2a3bf7a015e5ed967775dc96be3a71a7/14442608782.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087038ad5a83---kobizedokufatopukedu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160904240b44af---zetamixa.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bcdb8817c---89820868235.pdfIn PDF document text
    • http://kfbi.ru/content/file/roserisowezozevapofazixit.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b269d44d539dda1953ceae5e2b9e70b9/wewenasodutejazubaje.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/fiseveka.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/sogemefukoxexa.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/relolulivif.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc45c9c7fb1---28628182633.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a932fd3dafd---xelubiza.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/76523187737.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9bd837cba---15596127533.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/jevemigilu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af143dc4508---bitun.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16077883b2f084---xaloremesajuf.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/sibobexategepovavut.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac154d0bad3---zedijegum.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/rikamejofidezomodelug.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_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 17288 bytes
SHA-256: 8c8d917e60911ed21a40ff7d5b8baa516b4e5816939e0a291d7b74820a74d7ab
font_01_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 10684 bytes
SHA-256: e761a5410db243a519c28b40d3879492fd88fcf13610356c4993696906bb110a
font_02_sfnt_off0001449e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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