Malicious PDF — malware analysis report

Static analysis result for SHA-256 522eda8b5e8c6397…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 08:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa96dab9534d39bdb873630d53813b4c SHA-1: 6d2aaebd3be0564c131e981ee0dd05b82a1ac2cc SHA-256: 522eda8b5e8c6397fdc944314b4289bfaf5da9dc2de1b4e19451774fcda37d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to host and distribute links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ecableapp.com/FCKeditor/FCKimgUpload/file/81556337956.pdf In PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/bufazikinuletiwexu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607911f614d77---77150842008.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ce65ba7bd7c70cb26dbcf6ac16fd890a/ziriwufikef.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/32921004061.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbe18864d---mugodikoravililekiwaver.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/iq0ga4a1cdlg7f75u2hafovdlb/58522538003.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/86440860347.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/likevomi.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/xilawis.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/83201787114.pdfIn PDF document text
    • https://irantruck.ir/data/file/ruwigopavafobijifed.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/8471498280.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160edd688ccf0a---xesikogufixavarijesa.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/47848970726.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bejinajexitaj.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/86991491476.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf09e8bad40---44835530029.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b74fa6368---fomoxabowujabetukaz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070515254353.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/kejodigonikugabuwopumugi.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/50130537402.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/vamedekifumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=brief+description+of+bakery+businessPDF 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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 16544 bytes
SHA-256: 4e49d56da1b87acc1ef7f8d3863fe8c94c32881731421a93813499f6c2256ddc
font_01_sfnt_off00010d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 11064 bytes
SHA-256: fd923d011e4b93672388de9f695e61b322f2f4329077af90a741918b59e6eb92

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