Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63206ddd98b49f0…

MALICIOUS

PDF

98.2 KB Created: 2021-08-16 10:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 01b6e6b3a0ca61bae4d4ace3b4d24839 SHA-1: ccedd7519a76e0493a17fba85556dd648f76097e SHA-256: f63206ddd98b49f04762a33b134632a01dff59a0dbb1414b7726dce9c80d14f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c06b61a3---82550799098.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/177f117282da5c3c2494032d2143b752/90240818383.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadbd4951---46953178321.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a53bcedbc875124268f8e1b1d5b39c0d/88374608974.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210722031206483635r2p4d28hzacc.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/65158476453.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161154ab0d23dd---jipufufu.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/19710538342.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/51495241258.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095e79c4deff---figodajomezejuwepotigi.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c114b137ae---vivosixoxuzuzip.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/28309696428.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/61773029469.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3l9j2sj4bv725vu26ffnakdtpb/5806827262.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/51872809959.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/75985332215.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/61572981550.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c101667a5d7---70527467479.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/28601991339.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/wosejin.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jsjtu8ks64gab6i623hj66rrul/nofepelimoriweveta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=volvo+penta+sx+outdrive+service+manualPDF link annotation
    • 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_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13351 17540 bytes
SHA-256: f5d068c0c5b43307e64108357ac0c1bd73a2c9a8170320ed31ee53a8cdc35b69
font_02_sfnt_off00016153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16153 10912 bytes
SHA-256: c84f0dcacad3a3beeafa4a20cbdbcf4392b6e1efc7cf8e8da780b1470eb64223

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