Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28f0ca725e4885c…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 06:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c3be454dcfdba6244a12712e53aa569 SHA-1: 157db10bcb1b5446631fa23a37a7a411a2623114 SHA-256: b28f0ca725e4885ca97d0e0e2e3571b2d655247ed27921889400efe5af3a47ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of external URIs and link farm characteristics strongly suggests a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=lowes+donation+request+letter
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/3b1pa9ui2753utgg4ihn6esu01/ruzuzinediwivukubukez.pdf
    • https://mmszke.hu/files/file/11323524083.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7887c28246---rajalakuvexonopala.pdf
    • https://paklya.su/design/img/upload/file/guzotatujemowavigi.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/rqdfhgg725eds3orm1qujaea94/44466032355.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/tizajokibutoluriko.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/0bca53ba49899431ae9eb936c7076387/tozepemonefagisufudozor.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bfec872995784b454dd1b3289eac5f45/63424560019.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad78c469f4---madinovalosefo.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaffed1002---fulipegew.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160828b792c2c4---setuvobapi.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ebb3ec1fe6692deba1e71d129bc0aa04/zamosijapesatesokub.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/krb2dmsp1q90l6hs7ob7a13iag/82836753658.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fef45c93---domumuga.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608300dd70b73---pakutes.pdf
    • http://okmarin.ru/userfiles/file/75560974848.pdf
    • http://studiofranzoni.eu/userfiles/files/fixapajal.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff6b99884---94615662791.pdf
    • http://applexin.com/ttpsea/files/file/xokududumejurufol.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eb9b80979---89477504613.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8faf293f0389b6f4d201e12428e2b520/159432429.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3e46a5ece---suraso.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6n3onsca1l33vf6oj4rtcsu12/26096387482.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb7fbf14e---82224673274.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 16792 bytes
font_01_sfnt_off0000ff43.bin
4d0c3a30797725dd591709d84ec803a3035ff8b5678546aaacf12b31a7875b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 10532 bytes
font_02_sfnt_off0001173a.bin
552161c9bc66cd75ce56d0dae0f7f31638f9c5370732b7c54888310c4dd05d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 18160 bytes

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