Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac245164a68345ed…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 00:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f8dbbc0ac1348bb2ae64b8239c68036b SHA-1: 7bca756eed5773542097ed14b888a134fe1c6b62 SHA-256: ac245164a68345edcb217efdca720b233dd2379b130dfba3a7dec5d18b8433d6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://catamma.ru/uplcv?utm_term=tableau+action+filter+missing+fields+on+multiple+worksheets PDF link annotation
    • http://krukewittfarms.com/userfiles/file/vilonitudigawadidejufom.pdfIn PDF document text
    • http://origo.ws/userfiles/file/54567525069.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/dodimunuvakevixufasamu.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/tezevabobotuwalekil.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/fenobivizelevujubuk.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/92405695689.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3a469d435a48c739d48eef599e37f3bd/73253397592.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vajodidipizi.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210726_4347FD3AE315FE47.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/1401900838.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/51286386562.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/9363106185.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/notopuwa.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/81946943518.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/5f16a546186dc0f590b82ad2bd031ffc/xizopibagodoram.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/zufizumute.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/modedibixigaxoro.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c160c706b74---18422713663.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae970c4637---9511082658.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/piwisoruzoluliper.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f042806a61---tafubopazodudi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/coik503sun4nqcp6720gd182r3/kosefabogiz.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_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 11448 bytes
SHA-256: 7fc67b133f3898618512be64642d5196eb0758ae8e4043f6cb3323f4a128cdd2
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 18456 bytes
SHA-256: b3cc53ec36a7f637e2ee403619806220d90887cd235d1900cb3402747a0acd67
font_02_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1