Malicious PDF — malware analysis report

Static analysis result for SHA-256 66011bcd06c72dba…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 12:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38acf5e524e69c37f9ec0d509a75f4fa SHA-1: 55e1cedf4da574879338f9da33c6085d54757c3b SHA-256: 66011bcd06c72dbaa7e0b1131292ab17c82fc8eb8c7b1a38bf9a1f361f58e196
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pmfegypt.com/userfiles/files/kazulub.pdf In PDF document text
    • https://tigapilar.com/upload/files/42296069367.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/96265387204.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0e37c1246---metukerababuxudenusamib.pdfIn PDF document text
    • https://brs.jo/userfiles/files/43688341541.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/mc6akkhl17q02s1uju61rj1ib8/taxagupa.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/kajame.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc343db0bb6---60768601900.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae560b58e---4914822616.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8a283724c---pilupiteveverevadaxid.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/92765695788.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/72785117774.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/rutikobazodiviji.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/99cba1ea8b4ccc2d267c4338ea9f9eeb/13761802149.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c9ae00fa---juralilegejevoz.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/jumekopijudoluvoti.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/82r1bmvi46gp3omgo83fmoelno/33930330014.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/82808592563.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa752988bab---bepodutasubexevepi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4fcca6c7---zovekowaxazuwife.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/logonedago.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/laguwanajon.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/chc930rd3iiu36eh0htb1995t3/sopodigegipenofuvuke.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/fuzifogusikedemozofimagi.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kixujupukarili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=six+degree+of+freedom+pdfPDF 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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 10440 bytes
SHA-256: ab57e11d82f184082db88d5c9bc40edbbd84b56f523ecc83f4621a038b179f65
font_01_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 17996 bytes
SHA-256: ea363922eed858e4412a941a021c81d4bfc62049db35591c6537437c8c2544f8
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1