Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ed1f4c2b2cebf5…

MALICIOUS

PDF

88.8 KB Created: 2021-08-11 13:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19a75350a0d02fb62070b66d4896e3a8 SHA-1: 139e5729ec68cab2bb4d6ef100c877442cb552b2 SHA-256: f5ed1f4c2b2cebf5eb90ae897cc494287b75683aff9d13780fbfb537465e21ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://innotack.com/userfiles/files/76346236255.pdf In PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/xafugotaxanolojekaj.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca984c279---1620010024.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/17260132316.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c63dd59a0dd---badulipakobobagerelet.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609103dd6e5e7---dorafagetomoxexogosa.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/mawagutigego.pdfIn PDF document text
    • http://allycatering.com/userfiles/37871011730.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/63132951619.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf818fe9d97---mukedebugafezowujurex.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/65636177598.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e5e6554f3---romebigexa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/42002390209.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/55592942494.pdfIn PDF document text
    • http://dzbnf.com/upload/file///3800596807.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/34068635522.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/37249d820dbf6284a7dfa5529c0b7a4a/werixi.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107210132208981.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/99004032476.pdfIn PDF document text
    • https://robertbah.si/files/file/dadujuvokegelolagitemes.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3a0449e673d2796538163794b79a3729/89063866789.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/33650179703.pdfIn PDF document text
    • https://anfauglir.com/images/file/sufoxejuruputofa.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/696d0f497e3bdd8b279191eb325dd1a8/fewunojexejeneridud.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1626898469_fe07edfd10.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=r%C3%A9glage+%C3%A9galiseur+7+bandesPDF link annotation
    • 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_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 18728 bytes
SHA-256: 5d8df8a444b777ffe76369906de0421d96d239d5891a60dd12d1327690d8fd1f
font_01_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 10696 bytes
SHA-256: c3ac38df1655d967f458debd017427433c9612aaa5249e450ff7fecc3328fa8c