Malicious PDF — malware analysis report

Static analysis result for SHA-256 89152ffabf0734ca…

MALICIOUS

PDF

79.9 KB Created: 2021-07-09 12:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 15a904cadad346cd06d99e140be0b790 SHA-1: b6dfdfdfe7eb5cdaac501105ea41a96ae9e7bafb SHA-256: 89152ffabf0734cac353f23b117bc3d7f20758f9f7f3daf516bcd75459a2cf44
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous URLs that point to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates malicious intent, and the presence of multiple external URIs suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a downloader or redirector.

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 https://wastran.ru/uplcv?utm_term=the+next+term+in+the+sequence PDF link annotation
    • http://fapannimario.it/userfiles/files/62354444764.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0b143b261a6816e8cbac7078d1586f2e/bivezujizogafujaji.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/af1201c33be1a81db78baf529e9be426/5311763582.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/gawesiwevudoguxatifukalev.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/69433649587.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/31627555043.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/bofoz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ba8b0ec9a---bimonakefiminegexum.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fqt5vhkvc3r3apt61hcp1dh6p0/badad.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6cc87cb8---wodawo.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/nebiselipatugutorusetami.pdfIn PDF document text
    • http://nature-revive.org/files/file/kemawavomotimowusuzokaxa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d325723242---43688284265.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e7da31fec---gituwedul.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/gqk40ljbe6me0j50dh7s3a5ft2/wotozukowelirukegovejus.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/26999887e09e0e730a7192e6343a6ff7/15585258301.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/4bs3copaijrcu0j6jdq8mtc63j/wefimonemalek.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/maxal.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099852609625---linakagefojezeb.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/zufafagowudosazofelixagab.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/somamoselovumogij.pdfIn PDF document text
    • 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_off0000d68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 10476 bytes
SHA-256: f30c3432e50b686e1e24e4a72d5ba1e4c7e2ff40ffcb4539178b5313dcd47625
font_01_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 17128 bytes
SHA-256: 0466f41ae7f01aba6875fb5b8b96da8e0aec54a80cebbee458e56f71ac7b667a
font_02_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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