Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d58ba8a9398903…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 03:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: df63881e8e81dcea7fb3c4ec02dcc88e SHA-1: 76ee455c7d8bfebdc1b19526881864defb74ff24 SHA-256: a0d58ba8a9398903cb5326af4ed51da06208e0887c9b190a59bcbca5096d2148
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to manipulate search engine results or direct users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://techmechengineers.com/uploads/71047399191.pdf In PDF document text
    • https://tamphuctriland.vn/upload/files/dalopevavugejerali.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/fadesovisi.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/61807093114.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613282602c8e5---47081519829.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202199653308370.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/825gbt1ma5kvn4vc3go8efhv1v/14411217725.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/57259618153.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/81375978089.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/kubiwawinokupabilege.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/eb28b0b467b7eb97a9e801d4eee7fda0/pozul.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/21514495441.pdfIn PDF document text
    • https://morabia.fi/images/file/giwiwikerukixiwelesuva.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/43358028596.pdfIn PDF document text
    • http://hejia-ele.net/upload/50516744542.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161381d69c13ac---zotowu.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/desegibixuse.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ef931ea3---20633597968.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021090408271441026.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/banaxiber.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/65980593227.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/seboxa.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jewuzirujozazuwipi.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/96862644071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+shutdown+android+phone+with+broken+screenPDF 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_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 10972 bytes
SHA-256: c1aa143e39190b098cffa89f46c7a7a7f51604d223e197d4e4b16911de9d362f
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 19352 bytes
SHA-256: 2fef76e2d01ef567d44095769ce06e939adada7ab75826e0ccb603261c7c1dd8