Malicious PDF — malware analysis report

Static analysis result for SHA-256 2393166f122c74c6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 07:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9e7cbbcb92d210d96adc5f13d86c045 SHA-1: 645c4ca7a9ccbcea0431e0c8f96d57d869df836a SHA-256: 2393166f122c74c65846adbaf8828d1c542dc22c401441029e78d50bbd6a9f64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. One URL, 'https://archism.ru/uplcv?utm_term=ben+10+xenodrome+hack+mod+apk+download', suggests a lure for potentially unwanted software. The presence of a visual download button heuristic further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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://archism.ru/uplcv?utm_term=ben+10+xenodrome+hack+mod+apk+download PDF link annotation
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zisapunibefenomonowo.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/22409278132.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/19903341085.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/zigomipedamix.pdfIn PDF document text
    • http://savemaxint.com/files/file/makodusuduput.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/69085158.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/janejeguvamotesiboredapof.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/fuxamojosagaragudanuwedu.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/56825757873.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/lixez.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/50322232661.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5db6bc0138f6290ce461477d62486e8c/faputitaputisitezat.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a06f3a9b46e7d1af56735bdba675c5bb/lejexonatovifavu.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/wetefifotepozafabobijewa.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/40264473163.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/welezegojotuwusabe.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/toxapegoruteriko.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/28574435265.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/71413452321.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/86439022085.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29119756542.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/97703246577.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/75484608223.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f655nv36t3o44ltfbptq5c9fc0/46942651939.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9622352---86497237313.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/71462606211.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_off0000bb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 10928 bytes
SHA-256: 2aa60a5aae8d672bd4ec3df2ddf672c6ba5b6574cf50d755daae6e75fcff2957
font_01_sfnt_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 16948 bytes
SHA-256: 4726d27570706312a7402db59980a43486be9ec17ba42720e795f055df1692f8