Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a635fffe51287e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 06:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9c99cc608683e9ae6e608e86ef6a81d SHA-1: 458bc54926486c20148aec6d28330e04b795d5e3 SHA-256: 97a635fffe51287e071a4b944f8733396d9eb9b2feca382e138a2de1119d929a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, 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 presence of external URIs and link farms points towards an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=funky+friday+roblox+cheats PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e1b0efcf1fd94fd047ce60b1f294765f/kekekufeleb.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lugaw.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/luvigitekakajofodutet.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/25924760596.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/69763119622.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/63881514363.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/pubogom.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/39613137099.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/16009919530.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/91499632367.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e87733a16---6822846252.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/57712952192.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109171903036349.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/sexig.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210907032001.pdfIn PDF document text
    • https://31app.com/userfiles/file/pezugevumuzujipotesej.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/gokebuxaka.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/43827381307.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fuvodivixabewinivi.pdfIn PDF document text
    • http://neteyes.eu/editor_up/74809455022.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/bekavov.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tezugojezimapemezoxo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7026def5a1c6bbe69714cb1515a4140/80734007822.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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 17984 bytes
SHA-256: b71812eeb848c05076dc72427c4ef446ed16e490834b19bb00eef62b6dcd7a7d
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 11096 bytes
SHA-256: fc1367ef1c3606262d2ee93a9e4d0f4cde645a9696080c6e6e61c7fcb95b3a55

Open this report in the interactive analyzer, or submit your own file for analysis.