Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb21d049a4bb8f9…

MALICIOUS

PDF

103.1 KB Created: 2021-07-31 12:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9a7ac954e7adff21d972e8398205a1ac SHA-1: 2a11c34eeb1bd1f666dead52b87adffdcc7b55ad SHA-256: 3cb21d049a4bb8f9d1a6c2347666ba6690eca850d8a3ed82bfae4285e7599956
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, but the presence of multiple suspicious links is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 https://parokisantolukas.org/Uploads/userfiles/files/75429051369.pdf In PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/27094629119.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bc1d69ba2b2e946488755265bf64baf3/sinupafedasesav.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/37971331482.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a1519a9d2---lenes.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/wezafe.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/lititukifulofevexig.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa015d317b---pezuxitabegiwonodinoxe.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/63045946559.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/pigudenoxesizupe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607661fd35f85---pulukukututen.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/kipedejakupiru.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608864d17561c---60009768509.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ccd8e563---76586663259.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/20855174867.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/dupigonetusexelifeparo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777868d7696---xokipavifogejozogod.pdfIn PDF document text
    • http://coumert.com/images/file/xodojudafex.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/20474893568.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/79b8fa0a0ee6a92759a47c1a58047954/35634720246.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/watunaxuliduvazizo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ncd6gvi7c3cldt4v8nnq7b1q0f/33260339974.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc210f78cc1---5833855880.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b658b302a---renenukimu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad980c53128---59992289762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+great+gatsby+tj+eckleburg+quotesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10996 bytes
SHA-256: 6697be8d1069167933cbbbefa62d3101906e361e4d496c5fd471aef2a1468e50
font_01_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 29780 bytes
SHA-256: 19e750706db1434556823a3029d763051a1e707ea768ae50cb99de2ce0de9cb9
font_02_sfnt_off00015f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F73 16096 bytes
SHA-256: afac2f70e72736b4b18f7fc53bd43b7003cb1dc7c077d016d36afb74b1042de4
font_03_sfnt_off000174bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.