Malicious PDF — malware analysis report

Static analysis result for SHA-256 13333a025a13e5d3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 10:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 09f2dc8c36b29fb6a75cc7c41441429c SHA-1: 93842c4a4acf636f8491f582babfa1de5f975114 SHA-256: 13333a025a13e5d32cc6c469909387f61d23b6f2b7500ad27f9a2f0a671e3721
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links hosted on compromised CMS uploads. The ML classifier strongly suggests malicious intent, likely to manipulate search engine results or distribute further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abovomedia.hu/_user/file/55313267362.pdf In PDF document text
    • http://okwmd.com/upload/fckeditor/file/78301744354.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zuvivasanudiwokifapop.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/subotajozesajibugimu.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/sorafusojezitovafimaninas.pdfIn PDF document text
    • http://canoeing.by/pics/files/tiletuwizedoj.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/luwadurukoteritawolegebed.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97bdbc991---zafesilomoxiwoji.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c0bfed54edadef820380506323d15b2a/13074481095.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/38053367979.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cead77eb4a---81432621489.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8309b8d824---42830114056.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/fibezaletep.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/tac3ur53fbl5tr8lrs48dvgb7v/kerovukapavox.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610887819a949---safafubazajosulovuve.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/menavosa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081eec88633b---gufiso.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcad9aac638---zemoxidazigopogi.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/panetelegaj.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217bc5741df---vekuxonefez.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/78066483803.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/wemigaw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sp2dcadgngmr6kqmk359j3mfq6/rigilidosavikutadabukem.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e945e6578b---54062178406.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160807a36a89ef---16678783580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=synonyms+and+antonyms+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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 10476 bytes
SHA-256: 469222f6cec91dbc5f3e4bbd3c79cffe91cad304b7b925d0bda4773a1645e88e
font_01_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 19472 bytes
SHA-256: 1d0d2e4457d4607bea077249b2a626e4217c7e58315902d182bfcbb785c93d57
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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