Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc715d83a98a7d9…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 15:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca321d31447820ca6a6ad548fa95ccf7 SHA-1: faee618d9c4f4deb6852900f7fdd5eab2ff7e92a SHA-256: 9dc715d83a98a7d975031ae382ff1f147398a0d2987391ef9ddf6994e76c0659
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. Several embedded URLs point to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://szsahsh.com/uploads/files/tutuxokaxowizuzuto.pdf In PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/nagonexibopabolori.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/52003191159.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/42517533081.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/43138798831.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/85468573988.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/fozotenexajekipe.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210912002322.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202199178365706.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bozalomig.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161427cb78d3c0---90388046212.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/71409881535.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410facca4db---dimemowo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/gisegakul.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/9583787948.pdfIn PDF document text
    • http://alcantara.cz/data/file/rigewi.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/fuvolim.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/31f938da2259217b6d6f813b28836fd1/feziwopuf.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/dezusevamuraduzageseb.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/tofinetitabiwolevusopizi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/eb9226541f2b5a16e61b769282bfe027/vixipapomaxuxosojizesab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=real+cricket+apk+modPDF 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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 10540 bytes
SHA-256: ccc2e350e639ccd558e15077cba30274b3c0293af5b984800d1ec2f8fd251755
font_01_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 17088 bytes
SHA-256: 2152ba1efa8109b7779623530e2e2549b37fe1abf30967a103ad7e2df767504a