Malicious PDF — malware analysis report

Static analysis result for SHA-256 8418229783a3c12f…

MALICIOUS

PDF

120.2 KB Created: 2021-07-07 23:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbcfa1e57b3458f3a42d8cdeaeebd4c0 SHA-1: 4fb212baa79c4643c05912e8e8c613468f417ded SHA-256: 8418229783a3c12f4615d56c990f438612b7ed8edb398eb7573c18f3ecbf3be1
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF acts as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress installations. The presence of numerous URLs, including those hosted on disposable domains and potentially compromised CMS uploads, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608990736de5d---88820079289.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fdcca8504---memagodurowed.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/83647173476.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/14e10c39a26376a1ebaee42b84307d42/74629913002.pdfIn PDF document text
    • https://scriptdd.com/_file/file/45937130636.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2f5c513e913b186da4f36d6d08ab484a/94419743576.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4qgl5q8q1fndfe75fimsmprg1k/49597981472.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/dd99b5695f8f8adc1e1518231b322179/ropozukijun.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0aed6ff0---49948419480.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff855e4661---pavodixuwagoxisalojuvid.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/xebupadijowova.pdfIn PDF document text
    • http://pinxedien.net/upload/files/legarupaxanoduxedeludi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/peratatovejub.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c94caed325---71025590795.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f871ca36e0c15b6d4e1c144ea39dd113/xaguwag.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4fb6cce6---61289412858.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550b8e48cf---keruvigasiteninopafini.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608937348fdaf---fogobazejepogovuparig.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/48037574886.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/06ae76b23f50665270cc293c1634a154/80516000724.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/49100320692.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6cd16b30---34328205.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baee1646eb6---balefaxolitupuvipokije.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/5332382027.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5f1adf11144c017f49075865cd7b6100/53542880912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=new+haven+to+nycPDF 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_off000175cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DE4 10164 bytes
SHA-256: f0f207453d0a7f28816a3b99d1a388950f2640099a8ae0344873d9eeafc0aa98
font_02_sfnt_off0001a4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4A9 17648 bytes
SHA-256: 0c6d9dc13ded6e3bdb430cfdb7a17571c1989975b42826edbeee2ea5451ef219

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