Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1d521ee69bb4ed…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 04:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6259e8c741b8da7ccc597ab16d817f31 SHA-1: 25298af955012d53f89184baa18584cd413f5d52 SHA-256: ad1d521ee69bb4edac2f9be24ed084270c8580745d4af495d77947e709df9574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to external URLs, some of which are hosted on compromised WordPress sites. The presence of multiple external URIs and link farm indicators suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=watch+dogs+legion+apk+android PDF link annotation
    • https://remont-bez-zabot.ru/files/file/96999343950.pdfIn PDF document text
    • http://rotang.net/userfiles/file/25647029495.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/75379565728.pdfIn PDF document text
    • http://theponghop.com/upload/files/giginokusobu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4eda927e1---jojepema.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/gukazanelila.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/mojupegarosobuxipagopowa.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/81384395239.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/bibejozutilixa.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/92044240043.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/bazelilefagusegiza.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/9931241033.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/26760637914.pdfIn PDF document text
    • http://www.puhito.hu/uploads/moxejikubede.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/23818319567.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2c43f28c---mafibobiludoweke.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/31537432035.pdfIn PDF document text
    • http://bdsductri.com/upload/files/33585389038.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j12lj9oqbhr2p9am14lki2cp4h/82346201285.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/95573456481.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/10da6fb6d47b9509d957e8a05f2902ea/16488332061.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/2930037323.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613807dfdca29---vijowefelalu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/84629676672.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/takawanegagubowa.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 10880 bytes
SHA-256: d2dd0bb057c54b18162cc9360c4f791436f06055dcbdb8ff90a6c9a22016b64b
font_02_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 18096 bytes
SHA-256: 3aac8e6846fe3d6e56d3292e7c7fd59eef3648ec933e51beac3410efea2aa830