Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ebdb823bdbcda5…

MALICIOUS

PDF

95.0 KB Created: 2021-09-04 19:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b860703c534e711cc8c6f243ea99d2c4 SHA-1: 526a29e441fdb17abbc23bda3c5a87b8d814f421 SHA-256: d2ebdb823bdbcda561c50817e04be00105fdddd0cfeb9ea709fb941b49d476bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or use disposable hosting, indicating a link farm designed to distribute malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://polyalpan.hu/_user/file/99228567692.pdf In PDF document text
    • https://pearproperties.in/userfiles/file/pesojixibamiwosewilagesaw.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/vutimudelidarod.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/juxajafinude.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/gogakiditiwamujudubezenu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rajasutizeranafaguvoj.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607987dad725d---94113436232.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/regube.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5b0715b3d3083c485fcbfcbb1c751edf/fudupalejiwuxifetegusap.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/59030983516.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/nomefesavefogajovisonuzi.pdfIn PDF document text
    • http://goref.ru/files/file/gevepojaxatidisugevub.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-2/20210702062626494131.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bomegawedekekiw.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/jerogevegilam.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdf1a8ae89---14053786676.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/35185837802.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/79loq0sqsspc3qet8vtnq9qifa/2996140750.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/33905963904.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/15340817612.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/tabipaserisuz.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/43010726883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bimanual+exam+of+the+uterus+includesPDF 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_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 18696 bytes
SHA-256: b44b08367e8d661a0a391ba8dff612353a55189119fd4a0279f4f49be89801c1
font_01_sfnt_off00013cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAD 10996 bytes
SHA-256: db3ff7b0e61ea2ef46ed9c99ab72409830f1d0ad6afee56dbd3fda3680c679b6
font_02_sfnt_off00015610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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