Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1290664b930e039…

MALICIOUS

PDF

138.3 KB Created: 2021-06-28 21:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ee36db38f68007594a292beb09ff38c0 SHA-1: 036a3c70bee346f75598f4989a42c80102d10984 SHA-256: c1290664b930e039db3afbbae8031103fe069355a72c4c2f3394b7e110137a28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggests the document functions as a link farm designed to redirect users to malicious sites. The primary attack pattern involves leveraging these links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c1c0dc49---nopewib.pdf In PDF document text
    • http://nakajima-ya.com/upload/save_image/files/zuxeraledo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b532ec08898---96609301575.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb26c693bb---71520334231.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/phipsofg1p2bcet0mt8q6eds53/47104814418.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/95d4f88911db04843cf408f9bc6d32d0/85967521267.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/rmgfo75ore08guot4hm1k4hk5a/susim.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6df85204---botexusotoriso.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160929ddd952cd---vubagidof.pdfIn PDF document text
    • http://kleiberit.ru/files/file/xomunofa.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/xalapuxazodijar.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/xupifova.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccfe28e1c7---87835262947.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/auh49cbevqvd1kgvmmtu56lcbg/tilerup.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/fusaxexipujef.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b17ac9b2e7c---samegeviwepabadapokij.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/fetaxesejoferonoliraluf.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/c15e15bd3a8559327c10460100f138e6/34884964438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+long+can+a+green+turtle+hold+its+breathPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/xobaludifigobu.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e3bb6064a0a954c7bb5ca03f0164e0dd/29305414375.pdfIn PDF document text
    • 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_off0001b948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B948 18956 bytes
SHA-256: f1106e5c5ceb2ee044ba0ea593c30aeb992674874d43893fc6a3ba2417fb70bc
font_01_sfnt_off0001ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA0C 10964 bytes
SHA-256: 887584d1bec7b8417ddee352853205b69cbbff04ec79d9c87b56f106338ff149
font_02_sfnt_off00020348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1