Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf67842151d1035…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 09:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81efac83218bb33f9922dec967b39699 SHA-1: 205ba517337b6e7a41b42bf45abe16d7a0a3dcaf SHA-256: 9cf67842151d1035c26f655a60ad511daa472fe71f825529c4cd03192be17c66
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised or disposable hosting domains, a common tactic for phishing or distributing further malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://hurtmar.pl/Upload/file/bimederebipikawevowewoxum.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/mikiwiwabenefapugama.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8c04c944---73114550094.pdf
    • http://incucinaconalberta.com/userfiles/files/43345591518.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/jozumusiwejijesomunez.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e932bdab8---someboniwogufideneneri.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wutabakorafevasojojojid.pdf
    • http://1utilaje.ro/mm/file/lezemadetunoxabegeze.pdf
    • http://streetnn.ru/data/upload/ck/files/23485694884.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/lixijapul.pdf
    • https://istanajp.com/contents/files/mowekoreru.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e45e0f932a6bfd49958a9b3cd0cc56b8/lujuwakiwivizuralefeg.pdf
    • http://sicilyontable.it/userfiles/files/jekawugo.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/65892755809.pdf
    • https://allegypttours.net/userfiles/files/pawapod.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3bb19b104---resamepawapoxunudedabovoz.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f0240a9b878---megominedojugil.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/22e2645c58b1b9573d3ee21510d2a771/kojibumosiboxugaf.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827f4ac6e98---rukexudigefimuduv.pdf
    • https://cochleartudaskozpont.hu/files/kejiritibiposiwukimoj.pdf
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/jefagowuk.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a2851ce9b---9019925661.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=reactivity+series+worksheet+gcse
    • 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_off0000d316.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 16792 bytes
font_01_sfnt_off0000eb2d.bin
4e6915ae00b570bd4338a5aa32e34d1505b3e8fe2260568ceb1e91b14c86d73b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 10760 bytes
font_02_sfnt_off00010438.bin
f4bc06b38893b32fb03d9f7998057f35db1d37387de6c6e08ac479541dd3e480
pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 18220 bytes