Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd45b64cb125fa24…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 13:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f08762be4238704de07edde546c750fe SHA-1: 23296dfad8917cafc7fa2aa7b0a7ff59ed410a47 SHA-256: dd45b64cb125fa240988faa0ef4cc60811e7e7c8a6953d0d10775f086ead0dbe
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c74ae31fd8---kulolona.pdf In PDF document text
    • https://bazk.info/public_htmluploads/file/31857018096.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/9939475586.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/sewonizagofogali.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6d6ea2c8---wuzejesopifekeviwolujaki.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/kasuzetoxifinugulusewagaj.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/widasidoxok.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rete14rd8n2hmavu6u6ra25fu4/57285285270.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/16535912083.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/25281271828.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/popefuwubegenemaxivo.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/4649165452.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/megituzekibinujoz.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/83875473001.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d12d1e5b73fee9ca433b9dccd1b1a636/41378702398.pdfIn PDF document text
    • https://protum.se/file/todaxexovubobo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/gapegesu.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/050929168123.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/17211764095.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/88977368923.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/zebabezivakakegu.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/sititimojiwixig.pdfIn PDF document text
    • https://kapefashion.com/files/files/jasizix.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/pagadudoxivexibef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=unlimited+money+for+asphalt+nitroPDF 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_off0000b048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 16156 bytes
SHA-256: e28ebfc06fbef685d6b0de5daf3f008e6e505eef6aac8da296e89823862b82a7
font_01_sfnt_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 10884 bytes
SHA-256: f555ed61893b7706bab9ee9d14051371ae00de10312035ab1f3dca53fc8ea7c4