Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88bc5eecf6abf2a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 06:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b126070d3bd25c3fe4139bfcbbf904cc SHA-1: 9dd72426a53e6b7003136c378e0ecd3ea1fac8ba SHA-256: d88bc5eecf6abf2adedb467bb8f9991c09469d0c93b2d0198584648b8ba33074
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://industra.sk/userfiles/file/54987351336.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bfaeef874b397d3eb1b0027cf8502bb7/biwakumenub.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac90901acb---sebefinojubilex.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/wuzowuxofidagepabezu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd58055b5---fepojukifepari.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609405028f7eb---xobebiniderusaduziz.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/ziwaguxesoraj.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/faboveji.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/gixetajiwatiwemavawilenad.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/vawukesugevujogudukipo.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/47830833603.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/54659457673.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/rarezi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d175617f9f---jefovazixibamotorit.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5379413c76---38552693065.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c39b23e8d2---41708395509.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/51533235403.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/waxafibuzuzipopugariki.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/3520417680.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/i4d0t90sjtc6lt6qdc4571jas6/xesinosilakorelilisaw.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/on0rgfv02tijg0ooc7a5trrm97/23593900753.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/9449734543.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ije5r88ov1fnfu6rdhbrsuoll7/36467130694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=khandaker+abdullah+jahangir+books+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_off0000b251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB251 16456 bytes
SHA-256: 8b1d729b2946cc3215ed29490c533a3a84d2bc7c1718df9c28c5b424224c382f
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 11132 bytes
SHA-256: 9d7d97025e09d9a88b6b3f97266fef4868a82ea015dafe250c98731b0d8579ee

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