Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42a69eb6e5bd1bf…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 16:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b95fd040a34df2386c29163aa87c6b67 SHA-1: 6e35b9f648f65aa69475ee70b5c50efde25651ed SHA-256: d42a69eb6e5bd1bff12c5b2b0c8ae83040450f4bd3c69d181ff7bc7114c2ddc8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bayihoki99.com/contents/files/832513233.pdf In PDF document text
    • http://aolisenjiancai.com/data/files/58087257811.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/fofoziboxixamo.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/57373257599.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613514d7a5e75.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/pudumixawopanow.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/jivatalalakud.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/2105136439.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/8873646024.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/fopikanejigidikegu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/polafejezabogosixifamarim.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109061303186680.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/57791979540.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/bewepabuladawovagoviniri.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cf5cd66d---povegibudobozifuvaguzawax.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/17740449805.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/pifiwirifito.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/57459271504.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/23699765075.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/12975038240.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/76350800351.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c809cc859---wujojezazafekeximomi.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/tibus.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/81649363639.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fmed5uesngr6pdfv1h82531rrc/86964745842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=among+us+live+wallpaper+get+off+my+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_off0000c721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC721 11152 bytes
SHA-256: f1ef0877d0e464fd446aaed4c1c80b8171646117cc2a05c1a72d549f05a4125c
font_01_sfnt_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 17980 bytes
SHA-256: 2bd871d6bf2c7b4c448bbddc31ba7d1aade3937175e97ae165756477bf281bf2
font_02_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1