Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f9b03e1ab220b8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 11:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c1aedd7957f3d1fe2c8f3eeecb700c5 SHA-1: 8ccf882097f6dd2b03bef2a1a79b63acc38a748b SHA-256: f4f9b03e1ab220b8641e9c8e2b7fbb19198b9bf2721199b332a660adf1f24cef
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is identified as a link farm, suggesting an attempt to direct users to malicious websites. The presence of embedded JavaScript and ML classification further support its malicious nature. The document body is heavily obfuscated, but the heuristics indicate a callback phishing or tech-support scam pattern, likely leveraging the embedded links for payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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 https://medvor.ru/uplcv?utm_term=policegiri+full+movie+download+filmywap PDF link annotation
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133c2a8da90c---wikojowoxemujikolerumeruf.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/39927366173.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/71260811110.pdfIn PDF document text
    • http://friulanapanini.com/images/file/48820606900.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/30277724276.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/95338327034.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/jitab.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/pavodubagazidiro.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wawameladikebefopekuw.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/11246290304.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/37080787971.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/88187544575.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210917042139.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/pelaguxapirubutawob.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9ki3vml2bb2i72vcpscpqeapt6/54045936114.pdfIn PDF document text
    • http://goldmustang.ru/files/files/bojolexeg.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/nijogufebimemodefiva.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/85800342436.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/64004263366.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/10417151689.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qn2mi0bbsllmvm6clrkkjdo5u1/69348741699.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fudofivifanizuw.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/bovegenuxa.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_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 18336 bytes
SHA-256: 62b4534cb5386c33d75ae42844bb95b5ba574df100afec7089465a35a4168057
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 11064 bytes
SHA-256: 1f4301da6529ee8c7a4d07d1a39b9f3ec7ed07a0f0c1539574a43bc4b2a1ea1a

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