Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d90660c673c150…

MALICIOUS

PDF

79.6 KB Created: 2021-07-28 10:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 13bf005c0f3849780e073222f277ec55 SHA-1: 9b639e56f828661c1e424b960848040fa3df7513 SHA-256: d1d90660c673c150504a4b5e50c7a297b2a46e094bc7e11235e8b5d0a4b09ef0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748a2e60353---fewajukunugase.pdf In PDF document text
    • http://superplasticizer.cn/d/files/30163185133.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4efc29a3c---47443258546.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178916ddc4---sinasigotuvogep.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe303cf3c62---25694097138.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/510459e39018c87ec1fc2cad80c1cf5c/70998712455.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f479e89617a---29824328664.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608152cd2733a---44865363025.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/pr1klubbd15jcd8l95nfrjpeo5/77134625178.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/94841183572.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/1707084839.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/diwutijariwesimeri.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/46196571600.pdfIn PDF document text
    • http://denge.aero/upload/files/warujoselapegedenapa.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/cc9c9af67914c48b7867cebe869d4895/83221917346.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/61450772288.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2aaeb585e1b7e98c2dcb72c7afe0744a/zopaga.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b774bd19---maduxadu.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/vunozufagiwodavadodenofis.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/81537541263.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f732dc6a96---87980786222.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0a420545---93680429735.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82c15251d---gepumusovowubipeligav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=introduction+to+automata+theory+languages+and+computation+2nd+edition+pdfPDF 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_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 11352 bytes
SHA-256: 62d0d7964c9bbf58f13d964fb8bebbd583ff424a81231fbf22d6f3376bdbbdc2
font_01_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 17052 bytes
SHA-256: 21d9445c9045da0e40dfb15dd40afdb9fc1a461ff2b01c315deb1077dbcca7fc
font_02_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1