Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7a0af635045a28…

MALICIOUS

PDF

94.2 KB Created: 2021-09-07 04:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8316fdb37a13e3def787d7db0bfb4bee SHA-1: c8dd90e3ec833d1a4ecad137b14ff8ce313d31ea SHA-256: ca7a0af635045a28ac78e94aaf7a68b50469e9fd3557d7fac278cde3928394fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, suggesting a phishing or redirection campaign. The presence of embedded URLs and the nature of the heuristics indicate the document's primary function is to direct users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=kalia+yojana+farmer+list+pdf+download
    • http://agataklimowska.pl/userfiles/file/xusofejapafebezefa.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/34o4c604tudk0m5i9odh3h8je5/wikixewofali.pdf
    • http://www.deewanalarab.com/up_imgs/17397890487.pdf
    • http://simoncaulkin.com/images/50134460044.pdf
    • http://tycoonmedical.com/userfiles/file/jatolazona.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/vuriwujovijusigatavupebud.pdf
    • https://bcm.es/files/galeria/files/93284180542.pdf
    • http://summitremodelinginc.com/userfiles/files/bofiwixetelexilasorola.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/wopesufukobef.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1762476e---36298954631.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/lokivigopim.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/159lb5dn578te0tsgiv38uj8dc/40325984340.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210809090821.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8722fe01---37370328641.pdf
    • http://elazentrale.de/images/uploaded/file/danifemotadepitiriludifos.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f85ecf67ca5---34065998246.pdf
    • http://calliopegoodrich.com/clients/73417/File/pabosasujinedimubonol.pdf
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/52632529321.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/32276540847.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/dazubexurapawulu.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/boxodoxuwilegax.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161264debd8dc4---fowazopipokavebapumel.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lgl8squu8rq3cectje74hljdt2/filikelidutolutixifomefut.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/196c8a2ba48c50533abbb9cd034b8f7f/52571001748.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b7922e304---sulolarewonax.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_off00010a94.bin
394df3b68b504ce708cb5f23d0482bb3b7ce1cff7e8f3db78ddea9b8c7f2f4f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10980 bytes
font_01_sfnt_off00012417.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 16792 bytes
font_02_sfnt_off00013c29.bin
338b5aeec23816aa57d549198a406452a79551adf5922f357da875e9f68e3ef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 17992 bytes