Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd035e3c3426e35c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 12:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d16537046eb6f54338f12c1ab3748455 SHA-1: 13bb4db7a036af934a170d4e135815330ac09a8a SHA-256: bd035e3c3426e35ce8a83453901bdbd8ba024f7ceee046ed5914f8076d0cf667
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or tracking motive. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://crewmak.ru/uplcv?utm_term=use+phone+in+pc PDF link annotation
    • http://easyhypermarket.com/userfiles/file/lumem.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/badifazufap.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fd623cb34ba9400ea33577d943329f8e/75633993546.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/domorurikaze.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403c093a20d---74227511917.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc66ab615f---10584429080.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/kilareletifog.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1ea49f6f---viniforuve.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161445ccca912c---zizugakul.pdfIn PDF document text
    • http://rsentco.com/upload/file/vaboladufusomuji.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/megosaxiguwanilawapewub.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/xosigenejafijimesuziro.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb61753762---duzilupigetixagafu.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/9345415349.pdfIn PDF document text
    • https://breedlife.com/upload/files/80058822831.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///84666659159.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/92016306432.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/20219193820.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135540fc2b97---21290792685.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/60263198045.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/24636819205.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6ca4d3e6---ziwugokijeremidedewelimu.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/zevubexegijufi.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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 10072 bytes
SHA-256: c0d437e9f6ca0db471d33fee1fef48b95bf878fac0d50e21b1bb9f36c46b375b
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 18160 bytes
SHA-256: 466c8e211801c6974331b8b2dbfa79f5b571ffbb9411bd1eb68746d9fe6a5f19
font_02_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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