Malicious PDF — malware analysis report

Static analysis result for SHA-256 244d1df9bef50df9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-01 07:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e8a10f8da7fdaa6011e15329ec6ea1ac SHA-1: f4689375789f82bad2e6e3aed8d69ed5c91591a7 SHA-256: 244d1df9bef50df97e9af2e3a1ab421009ee52d072eac8cf1e7ab9d3d8003d10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://staractivecollection.com/resimler/site/files/pujakusufufijuzubok.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d88c243370---salelikuxixisavojazuk.pdfIn PDF document text
    • http://attlas.center/userfiles/file/35672733260.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/18075462411.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pogegepeboti.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9ef3262ff57fdabe68c600e43d3e8cbd/4702188253.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/komesem.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb03ceacca---rupojilimeboludoror.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f935bc7ed2---rifoditojabupuroxojugur.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/mugufur.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/62022843526.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/zoxolironuwobarodisofako.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6e5eb14203a2063c6bd47bffceb8da95/wominolimaviwalubasulu.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/3246963197.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11013d40f---24463325423.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/63052656861.pdfIn PDF document text
    • http://sakem.org/userfiles/files/riwopanakigizoleke.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/defc63ff028e83850560b99df67e25ce/26944533272.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/14822421467.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/46339448853.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2081519803.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f7af6771e966011cba66ee12adcfde48/xujavojekezinebej.pdfIn PDF document text
    • https://media-get.com/userfiles/files/werekite.pdfIn PDF document text
    • http://iphysiology.ru/upload/99674714678.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/40127947548.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/kotusekipopafufiromakomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=re+examination+questionsPDF 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_off0000b9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BA 13280 bytes
SHA-256: d06106f7995c1e0a0e2f199b7919a56ca7eccd03f55d6c27ef8605cdf69b4b15
font_01_sfnt_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 10516 bytes
SHA-256: 609f409af2e77e2d18c221908bd3b76a65dffb0a5e1ef4da002bbfeea6202fda
font_02_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1