Malicious PDF — malware analysis report

Static analysis result for SHA-256 0611137d1841bd8a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 20:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2e3accc7af83a62dc7f31b360c6a717 SHA-1: adb72d1c8e8f75d7663cd87fb71c55b168edc221 SHA-256: 0611137d1841bd8ad8e3f1a9a5c466c4abaa8c4d2e8bd9a520e72930d1860fac
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier assigned a high probability of maliciousness. Analysis revealed numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or spam campaigns. The document body was unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=ateistlere+cevaplar+pdf PDF link annotation
    • http://planet-for-events.de/userfiles/file/jidogejevidarixedugofipi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a406445d978---kunorejejilidiralun.pdfIn PDF document text
    • http://wawa757.com/uploads/files/64185462903.pdfIn PDF document text
    • https://seikico.net/img-tym/files/45730430761.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/63c84a5b294893ffa61400a80fb66016/31546865614.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/76895075092.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/vafat.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/80953045453.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f675ae279---tidebipa.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/24166203959.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/zabomadeku.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/lexuvudizogalajano.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bf39dd2a---lawijawek.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ca89da38857cf55bbe3ba4fbb4fba891/1356626977.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d6d4a861633696de701542d85ef11477/27128395808.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/95958559077.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c69349f0288---pilixiwakefodomolewirazog.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/kudizetifovak.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a2jcobvtkd80m5qnl97k8kaisv/13622447582.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/15035870a18d98248ad0c5a3b27beeea/58581885518.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aebf87b466---94063673257.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4f31df9a7219546c52074817f310ea85/77410879371.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_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 18240 bytes
SHA-256: c087c8dfdc2f7e94c10f8bb682daa2136e8693e6ed54fc142f26130c23d2a5b4
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 10436 bytes
SHA-256: 4528068110f199dad604b624e9135809c8dddc5416b4575379d0005c794efc6a
font_02_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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