Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11b5127cb893c21…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 06:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a198ba3f6f4395da7c618571c26e3c8 SHA-1: eb03056899ee9357b60c7c40adbd41b958c27ce4 SHA-256: a11b5127cb893c21d38b758f261259f303ad58588f33b4c8e6d58874ff3bf784
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or trojan delivery mechanism. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and other domains, potentially leading to further malware downloads or credential harvesting. The presence of external URI heuristics and link farm indicators strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5884

Heuristics 5

  • 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
  • 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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89f20ef53---totux.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/boxuvadijisimi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e04294513a---sozixewogorelefupuwuna.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vubegisijorizurunuxok.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/xojomadurobazugebunafo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607798c0cf437---sililo.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/gerimomitewimefajufimi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbce5e075f---27482096444.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/uakvd5sdbi5a6rrf5ggmhicra2/30777690972.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/93761981615.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a844bbafea---jivowuresalisamobileruger.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/48384076149.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/dfa55259437716e2fd74d864ec38b6df/18147917188.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/153735224.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/sawibewetibeket.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/pojowobavugejumuxuno.pdfIn PDF document text
    • https://invest.pl/userfiles/file/35489071725.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/mefonaguvatazara.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/63095322564.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/17186998324.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725a688fc22---40028710245.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/mixurafizigaxuloxef.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee46182b1---13241515102.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160730227b9a85---27207934438.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/75920752950.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0c439e4d0b1fba2874ab86c0492ed504/nusidobixemumepiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ctet+question+paper+with+answer+key+2018+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 11664 bytes
SHA-256: 075afd58041fc383ea81f53909b135a92b2987e0501ee43dd51e30b5d667b82e
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 18020 bytes
SHA-256: a43ef3b7a904ae740103dc56568d3a14520a55f22609a45679e996bfef0d8931