Malicious PDF — malware analysis report

Static analysis result for SHA-256 f627705ffd807218…

MALICIOUS

PDF

89.7 KB Created: 2021-08-13 17:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fadb25f417c34fcefbce33bc214b5fe8 SHA-1: cf34e478468eef6dda358c2b91d318a1c8b76135 SHA-256: f627705ffd807218d9f939099291ed44e7a6d9aa107f42608416c3202b46123f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user. The URLs extracted are hosted on domains that appear to be compromised or disposable, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160856af03d0ab---80427519799.pdf In PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/tolodidagoja.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/bivofarurolawane.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f61148f8edba35e5964b7dc9ffbfc52d/wabufamevijojavo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8f0955b435cb4543c4e3089317f438f9/mubanudidufelimege.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f802b0cbde---deganuwikudowavajij.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/76034428391.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gl9ggvoqaft07lp1o9fm0nfkh6/96199932622.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/41952474431.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/32229554143.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/xebopezagozera.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/8bb23c461cf3e30ef075041c30372df0/mewotex.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4aec8c69d31430be51b4b79768c6a766/14776827236.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2e58137360870d780eda76bacb22aaf7/zojoto.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e631ef00a1---87194994395.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/rogiwikopubowituxoge.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/funodeniguwikugorafos.pdfIn PDF document text
    • https://combrooncom.com/contents//files/95135635396.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/revasixasubij.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf4fd1a337---38558374480.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aad049f8---taduzidusej.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/17076620040.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/64067458238.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4dc4f64e1bea29fe79917d862fc91ae3/60138629622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=c%C3%B3digo+de+processo+civil+angolano+pdf+baixarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 18820 bytes
SHA-256: 7190c98f78f60e86008ea8965e0cd764afa15b34ec791181d4043dec299195bb
font_02_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C30 11176 bytes
SHA-256: 220200cfc266448f376cbd5b7464875d3b36b64296ca632d9c35b77ecffca426

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