Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ceb712739b31b93…

MALICIOUS

PDF

90.3 KB Created: 2021-08-23 15:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52fa2b2aee75bc8d27e3b7af7fb875d6 SHA-1: db66fcbb3437d143775e1be4d6d437587342c2c5 SHA-256: 3ceb712739b31b93679a193a6df8a10647766763d6b49ba1e8e232b87b3fd061
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to act as a link farm. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://brenna-ski.pl/userfiles/file/lazibejufojenopo.pdf In PDF document text
    • https://best-label.com/upload/files/tudodigasale.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c7efec1f78d556a76a75b58c1e0cc330/niruxurujasem.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/musaxipekodo.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/nadogafuj.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/40126680186.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/14720808465.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c3ebf0340e4c873028d023d105333682/80427134728.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16105d6e705e4c---sivibotomusaremaresexipi.pdfIn PDF document text
    • https://cargotavio.ru/files/file/zifotagobomisidut.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/jerujawujobewoga.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/75536154777.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/fomadu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tdvomfqui0v1lauk66kfq9t3nq/jimep.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/15309224889.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/39034112674.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bevelabilizonenu.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/65588539128.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d751aba0---nuparaxiwedodizage.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zewopu.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/57903117993.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/7299972544.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/49416438764.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0259dd23d78cbde4c4b0ee64d3f79f72/27835588817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+porn+rpg+gamesPDF 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_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10572 bytes
SHA-256: 4f08ffccddf5ee6dccaeacd1cc101b96399df22770177dedf462c7a81e090258
font_01_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 16564 bytes
SHA-256: 9fcba60bad3c3cf1a1d29b7afa7d9d40fc9e46c86baaf056150fe849c2e7d83d

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