Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f0acb1453a3633…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 14:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38949067920a0a7fae86d11ca1555dc2 SHA-1: 9a9d9ec467ed9f56ff7293f17dcd31c01f15a01a SHA-256: 01f0acb1453a3633116e37c71e3177986a3f449b0fb0fcb522a475d07ac26548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://inwebjor.ru/uplcv?utm_term=mortal+kombat+us+release+date PDF link annotation
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/wiboxuwipinuneditexakuze.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/buxosirosune.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/63736937199.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/natujetutadujurumozitakaj.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/26986483331.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/45442555158.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/fesopusipaxugiwuxu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161415a3b3214d---jiridib.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/aec183672afeb60a597fba718d8e9574/supigujuru.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/taxor.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/nisopazijegiximuvinabugu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/jarezafifobavoj.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210831_214134.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/doxazep.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/45345088869.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/99088275616.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/vasulekafipefuvobide.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/81214418349.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306cca84867---rodezawigafavajefulo.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/49011670185.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_off0000b93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 17256 bytes
SHA-256: af04ab91a78ae4dbad9cd326769dbacaa618cafe4754a1982635804a5c5643e9
font_02_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 10536 bytes
SHA-256: 7f7b63ce9202069378b952a5ef116a037763334128b92c3de256c755e18cc567