Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf10ee3dc91920bd…

MALICIOUS

PDF

104.3 KB Created: 2021-09-01 11:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6f55bb283c630bcbcf6f39e14593c04 SHA-1: 1f62e246da87c8516c5657cd88a4e602b6a55578 SHA-256: cf10ee3dc91920bd52e414a94f706a8983885710f4827a66e0bce67d38f0e86e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the document's structure suggest an attempt to lure victims to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=cryptography+engineering+exercise+answers PDF link annotation
    • https://presstone.hu/userfiles/file/54044514973.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160713c36b8a0d---gerofuto.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/vigedivaku.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/dibaxidaga.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/56724422464.pdfIn PDF document text
    • https://msiutilities.net/documents/zopegosolatesu.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/xaduvuvonazudofedud.pdfIn PDF document text
    • https://pecsikult.hu/files/file/46615887491.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/18995445574.pdfIn PDF document text
    • https://estoniapools.com/contents//files/80956404168.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/gakogumugiwudazefemivi.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/dugipogumaxefaworiwoveda.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c563ba00776---18632963667.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607435283b1df---nibufilemito.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d294b4e156---nusuzulipikudegapamokenib.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/baxubobeseziwav.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n130ag3el8flm7o1kmjf23nmf6/nuresunilavam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eba1aeaf6---10482573339.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/vifajuvivajak.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/gorokujevurolemufen.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7589da1806---jujisaxozidorokepebopib.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/31890606161.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/61735300833.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/raliramagaxe.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_off00012e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 10940 bytes
SHA-256: 9b675f717435df008ab6585887373fa291e0106460a5e61c15c7ed748adc9382
font_01_sfnt_off000147e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E6 18860 bytes
SHA-256: ec5b1ff3724d32e5e15503f3273e8fac9a32702ec813852efb554f0e3d42be9b
font_02_sfnt_off000178e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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