Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6a120c148976e3…

MALICIOUS

PDF

91.3 KB Created: 2021-08-06 18:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca3ecb4cd2bb78df1896b0d347ec66ad SHA-1: f36b07e5b9b9aa099b6b0161676b8d99f8d211ba SHA-256: 1f6a120c148976e3aded8d6f25412e73f6c27d51f9e5ecc6589361497688a0a3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5576c0d6f---19216732356.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f4466750---sovodulezerurozipokixoki.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/qeq20aqlrri99n7b10iuqauqb0/wekojujatewapizale.pdf
    • http://faizleathergloves.com/userfiles/files/14511518438.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4u9kbs0pein0cjtd6snd2jdnqi/74774731690.pdf
    • http://indecomavo.pl/inc/kakukukat.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f088eb69f4f6649a26ce8494898d865b/fijizituta.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb1de44fb---lunasoponowegakotapob.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/fanidiv.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/921kte3a84anr7qrq02culjba2/21050945011.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806b47919f4---7914674394.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d88d8d5ef---lapoduwasowopulemiwe.pdf
    • http://tokyoto.pl/UserFiles/file/70209851538.pdf
    • http://bestbuyfromindia.com/userfiles/file/wemunajedugukowoda.pdf
    • http://wohingltd.com/userfiles/49030144880.pdf
    • https://unserbiokorb.ch/userfiles/file/vogonakakikuxu.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/29843036232.pdf
    • http://wagnerpc.com/userfiles/files/disit.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/tedasamuxufij.pdf
    • http://pvvc.cz/files/19993277775.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=exercicios+sobre+ondas+e+luz+9+ano+com+gabarito
    • 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_off0000fb9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 16792 bytes
font_01_sfnt_off000113ac.bin
f89e4332ffdcb757f083a6eb4bb958bce8eb57c7f64886d86c95bcc47e11898c
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 18944 bytes
font_02_sfnt_off00014223.bin
d5373e2c682980cfd5f35739821dbc61b7861edcf5ec0e7a5f47a7db0f3e32ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x14223 11264 bytes