Malicious PDF — malware analysis report

Static analysis result for SHA-256 7770095f59f287a9…

MALICIOUS

PDF

92.8 KB Created: 2021-07-18 03:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4a7c81193eaba3b32b15559cd0c42be SHA-1: ec36e44ddc6d2fd4ad4a212758bb47bbbe718a6b SHA-256: 7770095f59f287a9f07bf14c0e5694606fdb2b088c3d2be05eb3be866f39cd40
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ab8377292dce99fd77f51004e7e6c1f0/tovosuwabadufirewasujoj.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8004d7ae28fdbcfd4f82faa4d7eee435/ripurolapiboz.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/432bb7e006b3d2884eebd09b507a1958/dobejetapofetukim.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/16172550299.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6225467334bed2f637da302489ccbb88/55456290678.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/40058941717.pdfIn PDF document text
    • https://invest.pl/userfiles/file/govuti.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/25404100886.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/4udb6jlvn4jio9g1uioh5lqkcn/wiperovesufugone.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/burhon20f5v546h7em7so5j0h7/kenawibinisesudake.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70e284743---2465022206.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/12235167390.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30013892914.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/wijedunur.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc0d2e803---zanadakefe.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/86727086282.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/h9861o6kvofll5cq0ese656c3d/muwusapesimekuwolaxapez.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3qb1643odbrbr4qskdv0khngdb/nadoriju.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pqcgclhhs6c6sv3473kv4nc9n6/nirazofav.pdfIn PDF document text
    • http://allycatering.com/userfiles/jijaputan.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hr5559mscov9s33hqaijvpliu6/98047244786.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db295007e6c---17307009375.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/roponulokofizuv.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/lefuvinotitekulomotakon.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/xuwipexulakejoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jackie+robinson+quotes+and+sayingsPDF 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_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 11080 bytes
SHA-256: 6f666c6ff36a2ed784acbc1290e03797f5165031985871de85273edc2c5f742a
font_01_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 18252 bytes
SHA-256: 95a146c8abeb86c9fda4af6dc92b7279abfc2ea6c49eda5f0397cd9f8bf61362
font_02_sfnt_off00014c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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