Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa788b090fa683f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-29 03:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 146912b4af7cc2e1097496a23c916bfb SHA-1: ee5819c0b313327db6d9e99b394199b70192dbb0 SHA-256: 7fa788b090fa683f18bc2933fb0eb915135472f539ab83a544694c18f1205d8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://globalsublimation.net/uploadfile/files/derobofitivizanefivata.pdf In PDF document text
    • http://chrislahoda.ca/userfiles/file/48929734578.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/39956573514.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/xapujitos.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/27885189942.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87872c7b---68798013679.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/81308432926.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/23277921018.pdfIn PDF document text
    • http://domario.ru/userfiles/file/29623555020.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/fepagifob.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/7157951605.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b5b5785b---vebanapijavonuxufumo.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/wekinedip.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/28875101672.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/37914745982.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/41358348210.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/77920556316.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4fe5cb57---xanemeb.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/xutulidizapopumeminimabas.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538a321d828---gigajomejawopusu.pdfIn PDF document text
    • http://asfalon.com/__files/file/xawusalanomul.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614a3894144af---6364253386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+free+voice+recorder+for+androidPDF 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_off0000bf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF67 19196 bytes
SHA-256: 42679119a075df688982296539ca1fe2ba7faf6513e6459de838ad42cee89f21
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 10540 bytes
SHA-256: 305c3698953af89a358bc409e43a25e908d8b7df1ba5dfefdc0fcd2c46c0856d
font_02_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1