Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0f7771ea0124a4…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 01:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d31ce9059b1d306af88991efbf46afd SHA-1: 5b0a539f784cb0f4be88d1856640c27229fd1426 SHA-256: 3e0f7771ea0124a4c4ad97350bf33ed8d062dfe770cb1ec4773673b2c45af757
232 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains embedded JavaScript and a link farm pointing to compromised upload storage, suggesting it's designed to trick users into downloading further malicious content. The presence of a download button lure and password protection for archives further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://hagabb.ro/ckfinder/userfiles/files/serapo.pdf In PDF document text
    • http://kunjipsc.com/uploads/files/tewukazidibugudosimadawum.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/bokajinawotulo.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/zakarenajejopigonu.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/50255419332.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/gaxivivewumoduwikek.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210726_132050.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/tameposomi.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/41753274620.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/dibamemobikejewafike.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e23a0217e---4613268380.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/vilunuroz.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc009526e---sewotuser.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/bogime.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r6l1bprkfb536ertnr66kp8irn/31977250645.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665df90d43---85265689597.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/biweruzugofefapifuwed.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/53784935931.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/44348473677.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/doluwokemejosi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e7b011cb25f4113cf33d4e77d3ac3fd0/tanodapudadis.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/43821845992.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gp3pt7hcoehrjb15h8dv0m9r97/86516276736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=entrepreneurship+and+communication+cpa+notes+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_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 18592 bytes
SHA-256: 2275b59b9874476e77fdd16d2f338ffaa80feb3e0ba13200559a34fa4e2496fa
font_01_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 10924 bytes
SHA-256: 560bb1cfc505f887a96e892503fa755acfac4c8f529444c7a51ae863a1c589b4
font_02_sfnt_off000141ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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