Malicious PDF — malware analysis report

Static analysis result for SHA-256 381975cfe612ec68…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 12:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84f8d6161d86b869347be89f526353fe SHA-1: bea23a8039e7b77be97b1eb0ad3a45c07402e9b1 SHA-256: 381975cfe612ec688ec2c310f2609d40e6210e957c90e91cf753e71f776256aa
196 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, with high-confidence heuristics indicating it is an advance-fee scam lure. The document contains numerous links to external PDFs hosted on compromised websites, suggesting a phishing or redirection attempt to facilitate the scam. No scripts were extracted, but the presence of multiple external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d8a8652e4cf833b6304be2b97c35abf7/20283886805.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/63065933396.pdf
    • https://bhsbeacon.com/FCKeditor/file/25452374197.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/talulomowikapiragoxofe.pdf
    • http://glovimex.com/uploads/ckfinder/files/bekibugugozopunobika.pdf
    • http://www.fdconsult.qa/public/uploads/cms_files/jidutaseradogesowa.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9f70de221dcb80fab96446644be7f1fa/matefaranosi.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/tibonuboletabijajisilunif.pdf
    • https://nnkcreations.com/userfiles/file/gupup.pdf
    • http://gtlfuelmarine.com/userfiles/file/febakowupelakefonagiv.pdf
    • http://theofficeplus.com/userfiles/file/vatago.pdf
    • http://clairerolo.com/userfiles/file/63961549877.pdf
    • http://wksx.top/images/userfiles/file/nuvosiruvataxiwizujiram.pdf
    • https://filetorme.com/upload/files/fojubuwamotitulive.pdf
    • http://k3projekt.pl/uploads/userfiles/files/dabexegafuziv.pdf
    • https://bandotrading.it/uploads/file/823497647.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/juvigiz.pdf
    • http://laserinnsbruck.com/static/ramelajetular.pdf
    • https://granitabrasive.ro/editor_up/60138957185.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25f975089---4307896159.pdf
    • https://flardochform.se/userfiles/file/15721386685.pdf
    • https://intrigantka.ru/images/userfiles/file/70927318601.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ceac44d2---wiwipebiwa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+change+processor+in+android+phone
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/061de3ce8e4cee337d1eb468e160f332/40951757087.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_off0000df59.bin
400e958a5bb7ed35a12bf4f514d8c777be9bb5608a6e82a38c4fecd52248b162
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 17916 bytes
font_01_sfnt_off00010e5c.bin
ece09c63233834413e3f01079a8b0034740e210f5c0021be43c08c7272272011
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 10824 bytes
font_02_sfnt_off0001271c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271C 16792 bytes