Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83885b3e19fd118…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 14:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2410fecd1bec3e2744763b9a1eadfb65 SHA-1: a6105d5ff957ba68723ecf60fe38ea4aa6bbe0e9 SHA-256: a83885b3e19fd118afd828fd356c32c258e67dbe2c378d3a0ce65481faa42b42
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, specifically by referencing password-protected archives and callback phishing scenarios. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and associated URLs suggest it's part of a chain designed to deliver a payload, likely through a link farm pointing to compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 9

  • 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.
  • 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://majubesar.info/contents/files/jugurefulag.pdf In PDF document text
    • http://yogo110.com/userfiles/file/854634217.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/49953161752.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/xizamokuzede.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd313c79b0---gumig.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///79595038363.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/kabuberikowajafedap.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/34469564840.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/wegegasidoz.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/pixumizuwozepebamedifeb.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ziwugodot.pdfIn PDF document text
    • http://vodova51-53.cz/files/9709769649.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/paderewesododuteja.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/xebupopuf.pdfIn PDF document text
    • https://tpk-m.ru/files/file/98581277236.pdfIn PDF document text
    • http://zuche0551.com/upload/file/13482704789.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/9610310025.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161390eff767a5---17921035402.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/gedadadifa.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/vedazasurojasukemofipez.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/refem.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0a4d53175f28e4fa1dc808fb76855fce/97397905214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+unlock+a+mobile+passwordPDF 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_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 11084 bytes
SHA-256: 4e6f0cd8f7bb4eaeb001c0b6783c6c000c941693e6c0f4fe5757e45178577511
font_01_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 16704 bytes
SHA-256: 823126633539b5a802cf1f69fac032e0a2e7ca201cf50cd8f25f73ccdb78ac55
font_02_sfnt_off00011494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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