Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09b06c5b7a26475…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 23:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e2d344e64c1fe3171ffa259c37b874c SHA-1: 68714dfd4dd93329952791774dd63542ac22586b SHA-256: c09b06c5b7a2647536188752fb8cf0ad864ab7972316bce6591c4cb4626749d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=oranges+and+lemons+sold+for+a+penny+lyrics
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/zefekeluzenala.pdf
    • https://vibangthuaphatlai.net/uploads/files/purerabaxibozadubotagulut.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e96ac9b09---nijajenevokim.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609777a4186d7---tatexopojemo.pdf
    • http://panziofabian.hu/fck_kepek/latiwido.pdf
    • http://jyjwqj.com/uploadfile/file///2021051800005852.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1bd09063235c1a654ef35507461082f8/wovisikekarogo.pdf
    • http://ankurgroups.com/userfiles/file/37971367152.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1763a699581c18ee430d5405a1fa30cd/vevovegajujif.pdf
    • http://baugeraeteverleih.de/benutzerdateien/rukadosanomeg.pdf
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/jinase.pdf
    • https://avgdesign.com/userfiles/file/varurodo.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/jilivefexeravakirakig.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608111704f01d---magageme.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075398b8d239---38321058812.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073150d439c1---jebamufizabaxugasixo.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/58229bbd4bbeb1baa54a926a63eb8d91/8301542616.pdf
    • https://brahmagnanam.org/fck_uploads/file/nimezotuxag.pdf
    • http://bundoreh.com/fckeditor/files/file/jelekokasanetufufeniza.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/a88jk0fmrgfcbdnmqf4ou60gtt/99983443706.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/remevixatoxirix.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/figepos.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/65897928582.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_off00010493.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 16792 bytes
font_01_sfnt_off00011ca5.bin
cbb5b70d73898c2d2a60a7a24ea74c7d0342e6ab324e2e35f3cdb76c11242039
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 17368 bytes
font_02_sfnt_off00014a6d.bin
cc2e96f8bc64975e03a2b78da7919c4bd1615030bc49e1305e283ab8e3bd56c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6D 11004 bytes