Malicious PDF — malware analysis report

Static analysis result for SHA-256 1628d5feb96681d2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 09:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6be189f96eb919fd51aab7c1ca57c948 SHA-1: 11d90ce918b178a37a43dbc6dec348d5169b679a SHA-256: 1628d5feb96681d27e0d8c7ae70631f8cf3c9ca9ddf1b45d993f81d6be66deeb
184 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to potentially compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inbond-cn.com/userfiles/file/84001563248.pdf In PDF document text
    • http://veterinariomauracotti.it/userfiles/files/66292451059.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ginepiruxuke.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/45022952492.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/64985109333.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/doxebejubolajelinuvi.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210908044925620.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/lixopiraferasuwo.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/vetobixikukekes.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wagakipopotamobewiz.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb8b47ff8ac7862af9825939de3e2847/85203351626.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6158be624bcefa3ad34a00bba6473db0/12744986543.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/nifamirevutujimolupoxipuk.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/debozot.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/9014109551.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/pevido.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4bc317de---70939123714.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e7373f11---tuguxesejubuvuxugemiwuzu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613640bf96dd4---rogotuveminixatutukuwo.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/5669325551.pdfPDF link annotation
    • http://hferrynetworks.com/FileData/ckfinder/files/20210903_7D35575E37D77D96.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8e76ce19fc7e810635479c6db8ef2c5b/14828198788.pdfIn PDF document text
    • https://hoavily.com/uploads/files/lusaladazorupezitelinowul.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/vevageziporo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=free+gems+in+stick+war+legacyPDF 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_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 17132 bytes
SHA-256: fe64845d11cf57947c6223ee9ae963f6c30059408e68748f75a6d01d0078a628
font_01_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 10720 bytes
SHA-256: d75f10c3f4c7406972de1497d49636df173db64a1f4f8b716bee8db05628c487
font_02_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1