Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ab952dddbb7d10…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 09:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a05745ac0971ea9509a75252c3fd6d2 SHA-1: b54f4bde6aa40f12935015bf9eb13fd098de0fd8 SHA-256: 71ab952dddbb7d104a565b35dfc3422288ddda02301040c33d6c43697757bf9d
164 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of a 'download button' heuristic further suggests a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cape-electronics.com/media/file/fosazinezasapojumuloronew.pdf In PDF document text
    • https://unicon-msk.ru/data/files/76917327328.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/bubusososede.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gixagu.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7af2b6197ff99abd1be9f8dfca03dc10/44173146382.pdfIn PDF document text
    • http://aweibel.com/Photo/file/wopisojikilapef.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/1772288939.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c2342b1ba5a77b20d086c63575193d2/82916798075.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ab068523---rezipaworixavefawu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/6278353141.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/v9ptfhkifsdonau0o739rqr8im/98963402877.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/mexup.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/cac766b9e5c8107e22a9587937c8ba79/10497877781.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/digelura.pdfIn PDF document text
    • http://ty-int.com/files/files/jutotirepafoz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9af3de9bce58c669fe644a59c4f2e761/vemezade.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/riruxafanemesuzum.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/85758606323.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/dba194ae753eb6d5d77a79ddeadd2123/kovigofanojamot.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/87465730795.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/juxopigijuvasi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b575189f9f9---webegunezuwogarefugov.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608990b7b785c---59058871253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sword+art+online+light+novel+volume+17+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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 11208 bytes
SHA-256: 89f671525b53036cfb6b6fcff812f8ac693f90df3abfb32115fb33d65769032a
font_01_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 20564 bytes
SHA-256: c13e0fe39eb7092eeaabddeb541bd2f105de65431fb3a863e1d130866b6f42a7