Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d2b3c4e4691aef…

MALICIOUS

PDF

84.2 KB Created: 2021-10-07 16:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf0bb1d8392aaaaa5820afb42b72907e SHA-1: 404dc31eebad1f097939fa8ec935c0bce098e515 SHA-256: c8d2b3c4e4691aef1ff7fc0150eb84ff8225025b44873b4a68ff4ec5e6b8a8b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting. While no scripts were extracted, the structure and URL targets suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161572a443924a---ketosomegujelenimabud.pdf In PDF document text
    • http://yey.uw52.com/upload/files/93906031681.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131313bd3a05---lolulogodegelez.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/namewulufubusajefu.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/rotamiteduto.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/58188786388.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/4846161268.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/volosegizofimipipumupobu.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/jufave.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/51682069568.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/94708593177.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/nedazugokorevese.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/28559413189.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/lolazasaxageba.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/gefojato.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/41786427948.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/91692516096.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/bufijiwazajolegigopazisor.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/70501525849.pdfIn PDF document text
    • http://emannsltd.com/userfiles/52210240815.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/35cb1b01ca42341a5f9b5e2e9b869f56/wirusowapufa.pdfIn PDF document text
    • https://umutfm.com/resimler/files/71827898237.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/vajidu.pdfIn PDF document text
    • http://tallygroupkwt.com/uploads/file/85486318212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+great+gatsby+full+audiobookPDF 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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 18500 bytes
SHA-256: 8b80281c17bc2842d26980c8a752e48b16b4b6a8e6df94cc9c94d609eb1b428d
font_01_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 10936 bytes
SHA-256: 2146097134cd2a659a14efb081fff51d60cd3f37d98116d95a44e1ca3cdbf26f
font_02_sfnt_off00012abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1