Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a7922a452b0c17…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 16:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ecf4746d86925db339fab4ed060a1f4 SHA-1: 49141baf7a09705c1182e57fe5bd1510684fe068 SHA-256: c2a7922a452b0c1772838e9abc7e9c1f89b2103528b16bd15272dcc8c11d0a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=painful+lump+on+jaw+joint
    • https://actor-conseil.com/files/file/33429503789.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d179eca860bf05fd17a366ef9bde5100/zijipire.pdf
    • http://gotween.com/userfiles/file///82491231688.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb1e66fca---90596562862.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4l9m2gmslghmtqp57tv4smutjc/86254225138.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/gefido.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02f15a89b---rumonun.pdf
    • http://pulsarvn.com/media/ftp/file/3752752839.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c079b531bf1---89052302728.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d6591b56eb98e4c6f26369e0283b674f/bubipesiku.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6ca015723a5467d76e378fdbf4c94f06/rububufokafiwu.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5bc76d1db5b6285417aafcc096f47d3a/94344944711.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55247defd---pomep.pdf
    • http://augustaelectricalwork.com/editorData/file/zobusufumi.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/m0s6cvdepu3epltj0k6jdtoi2p/58271924454.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607640aa2204d---senigowutonugi.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c4a5989d63f552a80debba6e025023d2/lonixidimivevalu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6cb839ec4---25719437707.pdf
    • http://ed-web.cz/userfilesfile/pixubezonuzajunojapuso.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503073254857275.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4be327fa---niwasel.pdf
    • https://pharma-tools.eu/galeria/file/kotigelefumi.pdf
    • https://upbfassadenbau.com/upload/file/36440445224.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_off0000fdea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 16792 bytes
font_01_sfnt_off00011601.bin
f25721b1b741c63b5c92077597fc356995a2a67b448bee2320e3b469e61294f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 10436 bytes
font_02_sfnt_off00012d9a.bin
b10696413acaa69f589c58189d1565e31b9319e1fd099eb9a68d909f5663ef33
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 16904 bytes