Malicious PDF — malware analysis report

Static analysis result for SHA-256 e943c47b40a72417…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 15:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9276b50eb462082529d910dcd4179974 SHA-1: bcfbc482a04db8c8ce66d05b692106ec05960d2b SHA-256: e943c47b40a7241705f6dbe90887a079706c2b59f739c0dc140fb155fa6fd609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The 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 embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=listening+and+speaking+worksheets+for+grade+1 PDF link annotation
    • http://xaydungphongphu.com/uploads/files/36809687209.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/644eb9d2134263fd54d5eeb8ef70cf02/27400561094.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/ritalejudotuboxa.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/9f7adda04a74ab8a0d48d9ffa3a122bf/xijoj.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/bugudafu.pdfIn PDF document text
    • http://short-story.ru/upload/file/keposodisuzigegedazol.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a194011869a---88842638893.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/30031442055.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b6a77f8ebbf32cd9228899d7a6c727c3/42199079919.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/53405117816.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/t5rsrkogsuc4dtd1r8q5thji51/86320249151.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/sevulopi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb03ff247f---95720970822.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/gimevuwavisoj.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/warov.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e460d2f3---33880214235.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/lituxukakupujonojem.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210826190258.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///girovafakixajutizewu.pdfIn PDF document text
    • http://esangsok.com/upfile/files/39971549257.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdd2642f86adce1d50074ec4847f63ec/54641281795.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/sefomafasike.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/separuvesekalixura.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_off0000bad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD7 17092 bytes
SHA-256: 92db3055f22a51c199fcf8fcbbd75dfc3ce6b923dabb0a7667475a0f7c844db4
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 10916 bytes
SHA-256: aeec7dc71c77d0c76108a6c787fc7104662188fb5d2b35a8d3c442d7470bbdcb