Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aee50e67f69ad42…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 14:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be3d7af7ecd92d433767829eddd68b21 SHA-1: d73c96f2b0435f82bc58247ecce8294b6a88e1d1 SHA-256: 7aee50e67f69ad421f4839f96e5667a42a38818a74c3befab66cc1191ab49f3b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload storage locations. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/eb766d77911b7ed50757f178e30a1e8d/pisitizunun.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b3031cf5---lepameb.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1fcbf0451---zepogatibukigotunuxeluzek.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/kipadotumipizapuwovozudar.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aab72ccd1ab---19894659793.pdfIn PDF document text
    • https://ikansambel.com/contents//files/10221647722.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/96d77eaad75962f99d115820a3f0b20c/xojovarabura.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210501110253_2124149476.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ea78e77539a1987c088165ecdf900655/41902917460.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/43370965322.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/22822891200.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/80215844890.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/82253007179.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/kerexip.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/sudarigib.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1d32ac807bb85c097570bef028816b0a/genolaze.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945dae00f21---nivazirugoxewu.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2f4679c6f1beee79be98fc8f2a94b407/40752702463.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/84492934382.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4116b14aa---xolobijalokokido.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede0b21636---6444938815.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/minitewe.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gejetenepomumojedorutipa.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad6185f0f0---jijeluzefupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=abroad+times+today+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_off0000c37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37C 10744 bytes
SHA-256: 25829c006984f3b0ace90c206727b96bdd404713f165ce337c43a497f630d3bd
font_01_sfnt_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16136 bytes
SHA-256: 10bfc4e1c293bbe08e26fdbf2e1b8f3793f8cf7c2901be6deb8c26056e86a04a
font_02_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1