Malicious PDF — malware analysis report

Static analysis result for SHA-256 e718365dcc3f4f58…

MALICIOUS

PDF

87.9 KB Created: 2021-07-15 23:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6af921852c22c7ab19a4ba991682d489 SHA-1: 0262c33e7622224c9f27b8453bb2fc9b4e45e285 SHA-256: e718365dcc3f4f589ebd82937c37c43ed513bf251b5b4e4df5908dca6d530872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=dreamland+burning+quotes+and+page+numbers PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ab85b968---85299614207.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/rudeturoburajosu.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/nedopugujuberomiwa.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28666692947.pdfIn PDF document text
    • https://airbays.com/userfiles/file/gadejalukikazesaje.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1152002cf2f62172a74eb4544ccba26a/nasofuruwobap.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c2f92e5536a652897f3d6b67dff0d988/84611010673.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/79799079360.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093e780af79e---3694698939.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/55475884326.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bc02ea68---sawepokegud.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713035945091.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/75830338316.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/lanupukofomuduxasivudafi.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zifiw.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/tujovitipozetewodipogofu.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/59358467156.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce2a7bd65381b4668f83fc8ef1b6fcb5/xajirame.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160782e1f64ab7---99437383635.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/4071600782.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/sgi37e538hs4jsjqeunk7h5ne8/63775209099.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/09034ae3b5403e1551a7772ce5800e64/70220359525.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/50117720108.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/xisubusopune.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/87511420319.pdfIn PDF document text
    • 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_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 17656 bytes
SHA-256: 27c5c3e4328a31604acc49d3de98557bc0b644cc245b86910717fa33b4d0ecb5
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 11120 bytes
SHA-256: 47a387ab70109e3946699e11ac77ee149edc6102f11d487a598cc59f3890e9df
font_02_sfnt_off00013b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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