Malicious PDF — malware analysis report

Static analysis result for SHA-256 726c1d17b3a2a1e3…

MALICIOUS

PDF

89.8 KB Created: 2021-07-23 01:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ca4d88419d35213a51154301a91ae9e SHA-1: c18896307d5f5864cc9ea9b76cac4b800bd0c99a SHA-256: 726c1d17b3a2a1e3456f5a56b7c57b911ce16245f6131ac48a0afb17fac2dadc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://unicon-msk.ru/data/files/39259089733.pdf In PDF document text
    • http://xlpe.net/Images_upload/files/86985870598.pdfIn PDF document text
    • http://agrion.org/upload/fichier/rikidivujozumexugixawepeb.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sugagologipajewewiroruk.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435f021c18---lotafilazovamopu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078233193f73---48138882802.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba5658ea6---24651215262.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67bf9abac---76834819270.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b7c5b661---zejigibabinizugogutiroxob.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97b219155---21067788876.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/45a65ebd55636c6487df5e38ff7ca943/85411244752.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/gobijabanisejipopavevatu.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/jirotab.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/65660052556.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6fedbe9d2---kabagotolololeberepinifa.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/8296586668.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab600926e---99632168274.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0656f2c5b0---kezoxemizatikevo.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/24725215202.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/96781605448.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/kenuranavotanivovenuki.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/sijazexojegisis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=a+substrate+that+is+phosphorylatedPDF 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_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 17340 bytes
SHA-256: c99eda2a67567e0ca84c74810db49a78c1733b4b22a9ba7d918aa14530ec92d0
font_01_sfnt_off00012649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E60 10720 bytes
SHA-256: 5388b7d92739adbe1e248b41ee42cabb36b0cc3569049311b29eeff8ac6a15a2

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