Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b55f714b95e96a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 13:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1420c9694dfc538a1f8d55d357ce3f05 SHA-1: b68d4b3415a49003c95accb20128c8fa26ed54d8 SHA-256: a7b55f714b95e96a0b40b2392fde52f830c3acd1eaf1a395d6cbf8dd0b528f51
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of a link farm on compromised upload storage further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042e221b57---63389990527.pdf In PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e9ef21770b91fd26fb4f5dde50e180ab/19452151888.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/siwezubanusip.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/zeluturodobopuli.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/50210119399.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/lasiwobinoroxukab.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332e4202993---tilagebujuzo.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/70416825902.pdfIn PDF document text
    • http://irollee.com/userfiles/file/37528880583.pdfIn PDF document text
    • https://12tiga.com/contents/files/mutekerumodekigamugote.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/godimowajadovoxix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7927e8ea3---37348665947.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f103caf4---tumajawopiza.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/86266690497.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/meponiniwub.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/39967150342.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161419069315b4---99982251257.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/debagapuziziginebewes.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/68640054556.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/80425483310.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/93749496209.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/zajodulutexopitete.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/giwagototimurirotuvuwaxu.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/99553102294.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/3893221574.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/zatugubuzupikeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mod+game+download+appPDF 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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 18328 bytes
SHA-256: 8876766163f0d9e4cfb85cbfca83b38c87be0048598ebb44fa92637ebcdc934b
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 10356 bytes
SHA-256: f59c23eac5599c0443d26eb3dc395af308bfbfb727df6af947ef49975ac01142

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