Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0860e7a797d79f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 07:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44da4289ccf526093d7f536267f4060a SHA-1: 8aec4755849c87bdc288f1167813d840e8ebc2ee SHA-256: cc0860e7a797d79fbfb9de053f28abad356e331aa5061c0dfd4b3241e0941844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=how+can+i+hack+any+phone
    • http://ikkosushi.com/uploads/files/59885110457.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9k9brr5mmfqa0o0cdda0i5729m/komodu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371902a2796---litunodetafovukosatalijik.pdf
    • https://komunalno-vrgorac.hr/files/deramuvogagozunefavotarix.pdf
    • http://candientushinko.com/images/file/novedo.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xotexaziw.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/35821635279.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/xukadudokasakekara.pdf
    • http://natpuedu.in/userfiles/file/rovajelud.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210908_A88F13CB440643DB.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6b73a0b125edcd1a8da1bd84d936f0ba/4506716820.pdf
    • https://telewebmarketing.com/FCKeditor/file/6509102867.pdf
    • http://flyingwedge.com/uploads/assets/file/54813763387.pdf
    • http://kbo.pl/ckfinder/userfiles/files/didasazaliwavu.pdf
    • http://reelproductionshd.com/userfiles/file/16010944770.pdf
    • http://anhhieu.vn/hinhanh/file/34121763388.pdf
    • http://weforyou.it/userfiles/files/ganawira.pdf
    • http://thibangoto.com/app/webroot/uploads/files/bizaxuvozukurarujover.pdf
    • http://2rent.gr/userfiles/file/fupisaramafefamorejol.pdf
    • http://vncanada.vn/uploads/files/3842647272.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317ef95f8de---fufewi.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2188b3723---89338260618.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ddcd7682d---zefifugejelivawiziga.pdf
    • https://birsamundapark.in/userfiles/files/guwijibobakobiwena.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/89621210990.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_off0000b0e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E0 16792 bytes
font_01_sfnt_off0000c8f2.bin
90a139b2d64aca3b6f0391e680b803b4d2cf1ce6ba8371c0a74b7ab5f28a0e89
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F2 15008 bytes
font_02_sfnt_off0000eed5.bin
ceb4d5a4c9a423b3ee59c99a11fdb829be11b6f555c4cc80520ca98a9b40f671
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10344 bytes