Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16ed77abbb2588d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 05:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9844afe826533afcf7868e89f10ae8a SHA-1: acc6c0c2e5540fbb27b3c248486152583b15427d SHA-256: d16ed77abbb2588dc78047fa63052b740f983a463737964ce1a25f2018916c32
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160945f8912a6b---guwimiduderaji.pdf In PDF document text
    • http://sattamatkapatti.com/userfiles/file/nupagozebibijod.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/balexenemisilefikapasu.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/nalaratolumadejafenut.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/migodosumewolemotufokamij.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/41703451711.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/bedotipidarifa.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/6077712426.pdfIn PDF document text
    • http://webursitet.org/Files/file/rawawabagujiverofogovut.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a454a6de5a6---miwixekutaxid.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/rimosewanuvikejokofebi.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/ba7688541306217cd4345f323aac4b29/nesalesawefudixagi.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/makigefemobeweti.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/23/woguvofitigegoboru.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080736176710---zimikanebatag.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ggelrhroo5jsql1tllaeakr9ji/kudedesigititosobeleme.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/bab1afd57c2ec4e6d064928ad310ed57/dativuwuxumogiges.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160948fb71640d---nulosej.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/jufosadibigifojepo.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/doduduse.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/1854660845.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/toxufixu.pdfIn PDF document text
    • http://gerocuki.hu/user/file/92171894217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+superannuated+man+analysis+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 10820 bytes
SHA-256: 47f49126405c8091b046dc33afad6a38a7a267eabd14ffce512a51b9696fe27e
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 18284 bytes
SHA-256: a27b2042bf416fd56074c2c64776bdb5ff36139210dde6b634b56c7d89d900ff
font_02_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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