Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c820067cb4ab9a…

MALICIOUS

PDF

89.1 KB Created: 2021-08-10 02:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d2dff6874c5a824f5d19a6b2b338684 SHA-1: f28d335717c227688c9f7be157833e1882c9df0a SHA-256: 22c820067cb4ab9af5602d35762a233601e4d0055d9758e39172686d6fb0bd74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ecoolteh.eu/galeria/file/xejitezekikuxixaxenajin.pdf In PDF document text
    • http://ekonopuntos.com/campannas/file/19053799050.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b126fe163ff---jadigotibaxarik.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/vikapus.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/37807995492.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/zewarenid.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/60696982408.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f428333010---gitixixij.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/68a96625982e19aef8d6101fbce53b2a/guluzijotigu.pdfIn PDF document text
    • https://cooperspick.com/files/xewerug.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd390dcdd---zokonujidewi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/femumojafi.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/sosuxilexazotitidudit.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/22430594157.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b4531d7d---zoradogokusiju.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/eaa5076d2dbfb929bc89bf9ae815aa59/23387095258.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/berefimero.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c46d787e9eb---bubodaja.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/kedabarojerojokanapatovu.pdfIn PDF document text
    • http://terminsk.by/pics/files/mobirabakudo.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/97859698283.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3bj2fcecnn16npk5s43s16c03/10042652198.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/libuvarosumanupojugunojo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1db7840e45---bitiderolo.pdfIn PDF document text
    • http://heureka-cz.eu/files/1745632590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+conduct+a+personal+swot+analysis+forbesPDF 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_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 16288 bytes
SHA-256: 6b19ea8d5893206ccddf8e728144d0e655fdef560fc108ccf44975ff8717f596
font_01_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 11044 bytes
SHA-256: 87d1a263335982fbe2146ec1034652e4bcaafe605bdb0428124eff5cd09e3e01
font_02_sfnt_off00013d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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