Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36246f8c5e4942b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 09:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6198c3cc80e1415a306609d346b6f46 SHA-1: 61ebab10ea23b864c53440689ce044b0dfa54d11 SHA-256: f36246f8c5e4942b6a9ec06ce89be7f8c715570fffd271b8df6ca0e24fcdc09a
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 embedded URLs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hoj6po71hgoba6vlbotglg1ba5/jawekimivogojusegu.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428d9d52f7---3815804840.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed487962b3---51425618436.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/ruvijukapafekewobi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4bf5515f75a53560b3bb9a161d9de399/65813371711.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wamirisumaketixa.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/79nvbtscv14tq0c0vhp7sjkka2/zamejejajozerozuwo.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/giratabijigu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e8ba067fc8f8dfa2a821d4f48d413c4e/64836383064.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/240f1266ef920dce58a54cff0e2bbc17/82850004764.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/613271668.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/mujosizijaliginizakabot.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/repudij.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/irbtogne1kp54pvj7e401madn1/79219975864.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6vgmsdvnf19m6euumlgcbblps3/wowugoro.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052315492826.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/484b5435fd7ba6bdfaffd3775d6fa84f/34331065327.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c220d63b449---3991618943.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/db0ecb78893f12e7a7db741b949012de/97792925339.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/58948577470.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/53457679999.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba933e16ea1---99738229917.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/52036574040.pdfIn PDF document text
    • https://dafelia.com/files/zufuzeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=symposium+book+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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 17120 bytes
SHA-256: 8170d85d5a2a90c6a0ed3e8b7285612f273edaeb397868d9dee75a3611bc5d3c
font_01_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 10540 bytes
SHA-256: 5616fb674622f1e4399826cc7b0c7a2b9c7253d5cb0b52c0de0d1c6920250c43
font_02_sfnt_off000132b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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