Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb3df1766a7ef27…

MALICIOUS

PDF

76.1 KB Created: 2021-07-04 08:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c938e3bf32a1a87a8a06e3cb9a28d71f SHA-1: c4223cac440aacd0f4bd57bba19ae3f797883f6d SHA-256: fdb3df1766a7ef279f23f4793368b0f87bcd67e9785c554aa2e599a2acb025bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate effort to create a deceptive web presence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=xray+mod+for+minecraft+pocket+edition
    • http://mwflower.com/upimagesfile///81347683179.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0f39b5a5588821cc785fa938050cf059/81979791256.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b03f7063c9---1970880226.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f2ac4f36---74946835330.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4d76vb3nj9o6l525157pgc6pt7/lidowagixolewide.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160dee09f75379---50438088845.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160833695e9d8a---zadexetebulemuluzetu.pdf
    • http://wadsoda.com/UserFiles/File/7698016172.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092eded8eb0d---jigoloxuxade.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d7ddb60d---minezufaxejojugage.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/51p76n112ihof1q9162o2b6df1/82386092356.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e57163883fdde5f44dfca93e1e063be3/getevukadabemujibofem.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/aia434knrmf6cf48ft74vrmlu9/1117509737.pdf
    • http://angarakshaksecurity.com/userfiles/file/lozetevazidonut.pdf
    • http://hotararicedo.ro/files/files/womul.pdf
    • http://doktor-okonski.pl/uploadimg/file/papum.pdf
    • https://adepotcustom.com/UploadFiles/file/20210607060903111.pdf
    • https://tomas-music.com/contents//files/16977687936.pdf
    • https://concertwristband.com/resimler/files/92486821523.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/besvbp8eofi3vkg4q7umjrr543/bovunupuxotakelivi.pdf
    • http://agiusfuneraldirectors.com/files/file/86428205261.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085e156d9625---zotofafowawakesaxodepu.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f5c602535790ef2990f22bb703fb9da4/nakugokanulekele.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4537cae62---kibunatavano.pdf
    • https://gbagencement.fr/uploads/file/81345637240.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0016f2a5e---jakuzikelazopex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c462.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC462 16792 bytes
font_01_sfnt_off0000dc74.bin
cddf4ebc7dcba37b3f786cf3b7f49db6cfafd4fd2b05a55d61e744d6e6bf6cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 17952 bytes
font_02_sfnt_off00010a1b.bin
ce178fec78150209cd380a939b7b366bb0e5bb8cda7c09d6b917d562dbca74ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 10780 bytes