Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c967bac25af87a7…

MALICIOUS

PDF

90.5 KB Created: 2021-07-03 17:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8788202d6458d414f309316996f809aa SHA-1: e1496e8f669426f6b6e549f1f4030e22310a809c SHA-256: 9c967bac25af87a76f4a92f3480c72476094b1491722e16595b4956dbd89539e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://laborke.ru/uplcv?utm_term=different+types+of+maki PDF link annotation
    • https://micsys.in/userfiles/file/92191480628.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/5ae3679fc8647e362509b3fe36eadbd3/mepiw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec897581f---fobirirosuwos.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/98646605298.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec3f4ec8c---numasenototuduwamul.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/napozipatolewusem.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/sugafakeropaviroxoki.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/91931448309.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/telumejavejedobipetu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/afe01e735cfb886a0e920ec3fe4b2d8a/vodegadozamafa.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec36e526f---64978225221.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/wijeva.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/62dbc0f06800091b045f2feea8495327/4064007246.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b673121ece4---44504154762.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d453a0f84f---vapuzofipiteganefakupogez.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/4681468576.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/avi6se7s3a36qvpqbplk8uvi2a/98960049026.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4itc26r3hu52vkku7bccqe3m5b/xugegogiz.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b3babee150b---xafofevezetutida.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t13jit9g9b2n77sj1od6uq0564/76888054083.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/sesuxexi.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g9lj3vbcpod5bco3kdje13jsoa/15045769563.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/bawoj.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16740 bytes
SHA-256: 39fe93a864695e880ad9357555ad42c83e94c4073a870c3f36a18260182936a7
font_01_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A6 10680 bytes
SHA-256: ce2a3c4d22d9a89f3c85ba34bb5fdba4e0de2f527239e73ec0eb53c791a9e7e8
font_03_sfnt_off00014d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2B 3888 bytes
SHA-256: 179d23cbfdf4e66a23ecce7bc0a9b2e61cf23cb7de7d5de90191d63d3a81dfd7

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