Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6d022c8806ffd8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-09 23:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 034031ad969b788979b82ae8d583ca96 SHA-1: 9ccca8feab52e61fd35d4d18a80f07092da174c7 SHA-256: ac6d022c8806ffd8382bd7643b757a87c637d74149de63b7d7cce923095d3f9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9b1cee3210bffa3f5581dc0cd0a23cc4/ruwogezo.pdf In PDF document text
    • http://hunicorn.hu/userfiles/file/16709231152.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/30640974157.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/85712826277.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/38775932926.pdfIn PDF document text
    • http://mdtrend.hu/files/file/42335628111.pdfIn PDF document text
    • http://chinalabware.es/d/files/pabowam.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/ligotaxisulaniwafete.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367d6c24aaa---23593056391.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/komawes.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/pofaxa.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/50424674684.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131588196ba8---lojoganibefub.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/mibizojowokajunevogoram.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/40049601692.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/sozovoropas.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/wavizadazuxeladamemesaru.pdfIn PDF document text
    • https://alpinashop.bg/files/9024699566.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/69213024625.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/suvusowup.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/20236782337.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161371e54ee97b---sinutuxakaputironirojomuj.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/48948059107.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/4842710626.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71b7f3ba4---tuzimopurisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+free+fire+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_off0000b45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 10168 bytes
SHA-256: 01e8cea831f15bf68fdb68186e7d47fc3cfb03ad5eae3679d9cf2ba2e7667c2a
font_01_sfnt_off0000cb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 14272 bytes
SHA-256: 996ad1cca3601b175b2040afb00a1f21dc4e89c1dde17420f1f76dae76089597
font_02_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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