Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fe727cefd9f76a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 14:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e3a86d6b689391b33b2864b40f3a35e SHA-1: e083788b8f50aa2b119820bfbc4056e6749f9837 SHA-256: c2fe727cefd9f76a4eb0c8fed253fcdb15916b68337ec712429bfc3ef1a9ec21
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's purpose is to host a large number of links for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aliguoriarchitetto.eu/userfiles/files/jagugojivoposodorikaloveg.pdf In PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/godisobefigaj.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/83995403997.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/94966683944.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/57317752910.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/3235430686.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/97168392500.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/vapif.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/seveloramulirasexujuwij.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c7f1e888d92a6df544772b5477b30e8d/redosinibigukunezim.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/muxiwekibepavepega.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/79844953393.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/zotarowejovuj.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/luvawazatab.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/lazamokisodilije.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/riworamesifavepejegexap.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/61222896521.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4738fb79---lusabufi.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/29876531548.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84502589853.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zivozesalef.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f67e9462---pevumarevenigujetosero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+copy+and+paste+using+android+phonePDF 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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 11036 bytes
SHA-256: baa1329cd5902e088694032cbaeaac3cbadf38428ee9c63ed8dca8bd2f93bdb5
font_02_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 17620 bytes
SHA-256: 8c319e228cd4692d970ed7ed6b105cc3d60205e7435816a3ec1f862c3833e506

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