Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aec6b7adb0affd1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 11:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c262f3632bcb62c2bdfc9d970799368 SHA-1: a509fda50a0849aeea3bbb3d20e570622454d278 SHA-256: 9aec6b7adb0affd114d04118f49c3d3779cf1f82e59977112b9cccab3b99073e
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. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics strongly supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=ps4+emulator+for+pc+windows+10+64+bit+free+download PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s85cgomc8emunnl3hooo2kh6o5/muvuxijep.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/94912256671.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/50079916436.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/63031742101.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/41841304600.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464893f2335---17451234493.pdfIn PDF document text
    • http://cmtsport.com/pliki/jomozililolujeberoxenoda.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109180542284498.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/fupopuronebozegeson.pdfIn PDF document text
    • https://durimawar.com/contents/files/lozezawidamipewaxazikolod.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/15124319121.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d3a94800fd5eb753c3f02bfd72fe6697/bamuwonojewezarudiligi.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/7480548547.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/93080533936.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/26047203133.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/zanuveledobonefudogobuju.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/milubogowo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161373cbd5be3c---xudokisakutojamawejut.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/novobevetusolidajij.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/zapepegilamaxejorev.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/15127904009.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/923401d774455b777a0bf359994a1f46/34735311256.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/65609528346.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/mojopelaxedapewiwerezakuf.pdfIn PDF document text
    • 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 17200 bytes
SHA-256: 15df05e942475c843443a8f06b38e669825ce35fe540915ed41f78b7fa6dd5a2
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 11528 bytes
SHA-256: 66c463ec9ab91cf2ae6286ada6cfe0276b03e371761d5fcbea2e4ee6071d1385
font_02_sfnt_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1