Malicious PDF — malware analysis report

Static analysis result for SHA-256 121798897aa59df6…

MALICIOUS

PDF

107.9 KB Created: 2021-08-13 18:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9618bfcfb7e8ff85ed2504748cdd47b SHA-1: d5b548dfc12af4dde7404df1eff21b9608b3630d SHA-256: 121798897aa59df6269708b769a8aba467baf7bace5818f64ec89d866b4f1d99
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to initiate malicious actions. The heuristic firings indicate the document is part of a link farm and attempts to lure the user into a callback phishing or tech-support scam by presenting a fake urgent issue. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anhuicrew.com/upload_fck/file/2021-4-30/20210430020152308519.pdf In PDF document text
    • http://daiichihr.com/uploads/news_file/96193489188.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/63011247954.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dfb627b6---60699047350.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074279827ef2---64853932849.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/87516057962.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb29426b3---31717055092.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/mpl1fntdarl5r2o2kdtf5ss403/tunibuvezarurulepowef.pdfIn PDF document text
    • http://hongdacable.com/d/files/guxebifusatibedenoku.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/55509170069.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbc6b5a027---mikig.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t63irrbn5gh96067lbnsj13t46/89755112091.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/ketogojividepegufu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91759bcdf8---84908334727.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b22d79f9---vevukigobaxozenolele.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a0b6d9300---tavigoxuxedabebugapit.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/klp87r5au4eic2f34dkiposjgj/63475605061.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/musamatamivivodab.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/93836570329.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/jarozujozomipiso.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c954058a3a0---jowexewuvirexidajarix.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a5243241330440100a2f3b1c5191f3e6/61330793795.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/27eeb778721708cd4041b87c85f1610f/ligun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simulating+half+life+lab+answers+penniesPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6f6fdbd0c21ea5097404a023767b3732/dixipopeb.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_off00013e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E79 11084 bytes
SHA-256: 1193bf98aa42e8fdc9d40a537be5b97bb649b0d1d1634a93253168e81e622bfe
font_01_sfnt_off000157ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EE 19248 bytes
SHA-256: 3c3322e5aba57883a96a66aa3609ee1508984ae7ba3068a9465de2ef01c3f68d
font_02_sfnt_off000188ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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