Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6118fa557319f8…

MALICIOUS

PDF

90.0 KB Created: 2021-09-04 12:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71bc4934c77876cb2a6e9f43a5de086e SHA-1: 2b433e3e2a0007d4ace5dcc0af5dbd63a4c0db93 SHA-256: 4e6118fa557319f8f360875c7397245050b19ad0c13219ed9fb99fe9488b5634
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated and unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://astmasme.com/userData/board/file/jadosivowununixivawubila.pdf In PDF document text
    • https://rugsinc.in/UserFiles/files/78194640863.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ec6f010f---91577223662.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105674274903---31200242876.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e0c6726954d8db32b388347da62109af/96797439823.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1efd9e2c0c---judisun.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/33386375795.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/36921427610.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035c94a1d8---mopomifejudi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/36e48aa4f736fc0273ba703b19edc6bc/mudetakevaruwakewu.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/64509368512.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/xedosivose.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/gakebowowononuzenuluwa.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16128376087fd9---luzot.pdfIn PDF document text
    • http://dzbnf.com/upload/file///33328765444.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f06ee1ce5cb---84810498841.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/53839670495.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087040e9553b---wekil.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/13641053865.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/mozetepisodikepebokonumer.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/04bbaf7456a6841fdb763d0b305d7e19/monewivapibajaz.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/vobimowotozibilu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/loxesitibojanev.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf631bd438a---8859756186.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/47095144642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=facilitating+learning+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_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 18420 bytes
SHA-256: c21f9b2bfa3cda01d3d64721f6e3e8f04fe6adddc6145d2429de090dd6cf3926
font_01_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14296 10484 bytes
SHA-256: a86437fa394f7a8c9abe85ae147c95d5ed046e16e434e0f0cd44f3e4c6bc12c4

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