Malicious PDF — malware analysis report

Static analysis result for SHA-256 86627887b4ebd8aa…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 03:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ec9a05236370b31e5ad3cd2ca513ade5 SHA-1: 9e99441d5032b3aecb37579722392b7cace50252 SHA-256: 86627887b4ebd8aa331f5561f71ce91d9aa0ade9565ae9c28e761c1b8f72c819
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://irlanc.ru/uplcv?utm_term=gta+san+andreas+for+windows+8 PDF link annotation
    • http://fabrikando.com/cmsimple/images/file/37641407830.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/74208815887.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/gepavuzekopewegavonete.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ef498a95a064dc8171da42a84b445b3d/ladomomaremelixetetu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/73022319461.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/sositi.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/68450038369.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3p2brf9gtliqieasaons5dne35/49571144520.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/51555406994.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pofuxavaxa.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/64704225594.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/1719886412.pdfIn PDF document text
    • https://clinicscrm.com/img/files/nuboluwi.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/207534486.pdfIn PDF document text
    • http://hijoin.hu/editor_up/40683271880.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/memijosulopadikugejemob.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/16474898178.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/75164696628.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/bosetulafejedudokenisoxir.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/xawakevibolavuf.pdfIn PDF document text
    • http://telektrans.hu/editor_up/satavugigujitetevoturu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142419cc5532---kapaxowasi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ddc83b96---83337170725.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 18220 bytes
SHA-256: d0e4a32b28ad1cfbd33a947d3b5a78b6be16e2ae24bd194b7b224a866d163684
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 10632 bytes
SHA-256: c760cdc3dde34423202d2c8f8a2af65c58da1a2cdd819af2287cf97303a637f4
font_02_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1