Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e253a9574301f64…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 09:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91648f4872214003bd7ccab15273282b SHA-1: 5f031a1f4b6a25767eab210fdfa1d105b7df15da SHA-256: 7e253a9574301f64cdcac1e431b45507c1ead3d44fc5444c61a693904da7d0b0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://go2germany.ru/files/file/67594044836.pdf In PDF document text
    • http://copy-office.it/userfiles/file/49739220074.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/nojozat.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/79524752592.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139232bc7475---24822954116.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/88e8e82ea8ecc4403e5304d9014225de/49345538514.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/zanoboxez.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/misegu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/69944199432.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/97647892786.pdfIn PDF document text
    • http://esipro.be/userfiles/file/baregaledoveninezewuk.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/520b5bd02d05a68c216e6cbba35fb184/towarevabovisuxuguzen.pdfIn PDF document text
    • https://masukpt2.com/contents/files/sasabitavubirul.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130745a2fefe---wubiwoku.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/wukupadafed.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/lopolozugokatik.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/53855724570.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/wolegapipakuxaw.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/13205729033.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/sejizimuvigurifabotetod.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/gatulex.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/raluruz.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/9317657717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+complete+dead+sea+scrolls+in+english+pdfPDF 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_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 11028 bytes
SHA-256: 13743972e8bb4250bfed96d149a37946b551b4cb9a93f31ea9f21571549de5e0
font_01_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 18004 bytes
SHA-256: 3fef109735fd0d2305dc3c659987bff9401bca0beeae9573454e0afcb0df1c36
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1