Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b25d28add981eb6…

MALICIOUS

PDF

90.6 KB Created: 2021-07-14 05:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eeb08d49b75ba77e3028688bf85e21a7 SHA-1: 8b252bf93b91b03cd439a841b4fb1122bab442b2 SHA-256: 4b25d28add981eb640eca73c623790aa468ef07cc9cc777ef4e3e3e80defb67b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide clear textual content, but the presence of a link farm and the high confidence detection scores are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=how+to+use+laptop+as+second+monitor+with+hdmi PDF link annotation
    • http://udokutscher.de/gfx/userfiles/files/58257674152.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/mejeli.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/33e3762437989e64e3e4e3fdf6468186/61574844186.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9fb6c22e8ba9f1575adb536e086650a6/81122117853.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4df7da7506565fbfc433b987b72d2429/74494480808.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/20022249533.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd718bec054---numivoxuvu.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/93042572486.pdfIn PDF document text
    • https://limmaginebistrot.com/file/tanuwatopubetij.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1gvv95oh87fp02j1to5mbkegq5/26656339403.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o0fnsov4cg8scl04mt34eepc0u/zugusidaratarubakigixibe.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xijamokafekafepitu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc644f585---25399558655.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/diwiduwaguma.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/wifowudofuvorewinowoji.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/wixutanixixat.pdfIn PDF document text
    • https://aashianarealty.com/file/wodebisopoginibalozoz.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///sakatiluguwafuke.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/273c56dd5458606b2b4dccc7338a49f5/novikojelilolobikizin.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e4ae61df393cfbd0b147d94a9612f7c0/mupafofusa.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/muzilopijadux.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215201241195020.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fbi66vs1nbv5g06of6mjrbcuu8/jipuzexasanideluzaj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4e638311---18521539392.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3c166683---93770122848.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160908b6a48837---19824493904.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_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 10956 bytes
SHA-256: cba97f51b1aad992e42ca242ab4ca8842c873937e55d8f685188212d66da5906
font_02_sfnt_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 16820 bytes
SHA-256: f58b4080dd65f8a69fe90b56bcb319d1df709d2d47586970352e77f8c723d25f

Open this report in the interactive analyzer, or submit your own file for analysis.