Malicious PDF — malware analysis report

Static analysis result for SHA-256 90071d0e0cbee4b7…

MALICIOUS

PDF

78.5 KB Created: 2021-08-28 15:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 466f4d77d45bcce16d5c8d7af5f49798 SHA-1: 03869b719a3ac2644d423db7764f6ed53091753d SHA-256: 90071d0e0cbee4b782fc0c49cfc81230a17693b7ca54679fd0212d0fc2af16cb
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 pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL analysis point to a malicious distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/dc51f050c2a076ea9d317d6635273b4f/61917075740.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8091a80935b2fb0163734e695414c505/20216448556.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/42141586063.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/zevipapubar.pdfIn PDF document text
    • https://amblamy.ee/upload/file/59979058875.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fiwidor.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/varuzufagijagamowiju.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/bofokapurezijanired.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/dfef42833259a251cd2dde8c0b35499a/49879057042.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/pudejiwojize.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a190615c1---24009150597.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/xeredag.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/88825375990.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/wobuxedozokudusadito.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/savro3fso9kjn0vn9f6odo64v2/37747594585.pdfIn PDF document text
    • http://wawa757.com/uploads/files/mulisuse.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/92445602067.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/54389947385.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098352bbfc22---7380030041.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/43681006202.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/loraduvi.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/48656319183.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109be4fb91c7---34572404802.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/supuwipavetave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=funny+exam+answersPDF 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_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 10292 bytes
SHA-256: f31e076ab605c4295ba6be1f885bfffaeb108904fc46560b50396448836b9446
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 17608 bytes
SHA-256: e49d804efadfe47ee0af5353af6b088aa0e490612a330234f107c63291ffb612
font_02_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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