Malicious PDF — malware analysis report

Static analysis result for SHA-256 a322b6c1ae237ad9…

MALICIOUS

PDF

86.9 KB Created: 2021-08-08 00:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5ec01d7bce2f1672f722517f41bf1b6b SHA-1: d9ac4787915f9201bdd4124f31189a0af8bd1cd6 SHA-256: a322b6c1ae237ad9cc399aa94ef14760ac53457010f93a536ae0f2ab86279ee5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ghalemdi.com/userfiles/file/59153081297.pdf In PDF document text
    • http://jngf.cn/files/file/mabepemarodove.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c5c8efa6---rakafigabosowibonelakemov.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/33583231892.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/53018970981.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b035b3f2f11---83906448900.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/76136959127.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/78698850132.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/6569b684bb7a8781147051fe8bc8656c/3363191295.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/77011439386.pdfIn PDF document text
    • http://beiks.info/public/file/mizugumepijaliravorozileg.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba0b102ce---54999494163.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/3423777600.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ddccb73c9f9---88206870669.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/57jkmool1i5vj7fhvfgspt15rp/69228209151.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/damajufij.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/96590570265464ec9280d0e2dba8b2e5/saxiralimawuzorizeje.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/49646870985.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1de8276f1---14600401803.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/mudorikekemodu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03dbc8c96---zadinetidoxobowewu.pdfIn PDF document text
    • http://aplus.to/userfiles/file/lepopixejufonume.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/tefoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=snoring+mouth+guards+do+they+workPDF link annotation
    • https://lapdonline.org/file/64855687819.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 16672 bytes
SHA-256: 81afb00f72bd948633cd066bfb7be6b45ccf16f8314b4b89adc994947ed18d30
font_01_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 11116 bytes
SHA-256: ceefc4c73990994257208996d97f3033077fe79392a53d63c47432d3191549f4
font_02_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1