Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bed81cff7f70ebb…

MALICIOUS

PDF

86.3 KB Created: 2021-07-01 09:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b490c925b379a5cd2abe1bb42cd06f04 SHA-1: 7fc02e071a283e71b90359d8c70d03954d2806cf SHA-256: 1bed81cff7f70ebb0cbd9068036f0f98cdb31eaf23e4f497119430b1bc85fb8c
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage external sites for hosting or distributing malicious payloads, likely through a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf873abf8---rejadenudakamiju.pdf
    • http://polishingmarblefloor.it/userfiles/files/73869430546.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca019c273---xonibixuwodefagujadef.pdf
    • https://baxsporthorses.com/userfiles/file/76301738032.pdf
    • http://hb1004.com/userData/board/file/58367747116.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c90a838f1---17593158993.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1004edaf9f---93491950505.pdf
    • https://ebooksweb.net/files/file/82491437060.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae23cee058---mopurikelujotedanetix.pdf
    • http://hgbs.de/userfiles/file/jobijuroxikizakufezat.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6ca75f15f5c1f254bcc1830630cbd2ca/winawafomi.pdf
    • http://burchiellati.com/file_fck/file/velaragerupuzoponuki.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/94881414811.pdf
    • http://bebelino.ru/userfiles/file/zasijema.pdf
    • https://pharma-tools.eu/galeria/file/mafumexuwexesesulaz.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/ruxasuxeluzopegaxogonip.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6862266d---35244531822.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b248c58a1b6df126b612992d831317cf/69795501749.pdf
    • http://merlegdoktor.hu/tmp/38599405061.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/908a25b3fd0365f80c94a6caf9dac765/90563611080.pdf
    • https://clubsportedinburgh.org/userfiles/files/75506827636.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc9aa74bd---8692359281.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288fbe1ddf---rutozejero.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/feqac93744gnu1d7p7q98rp711/latazejepuvobasijot.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072449c2ef68---lamobigowezojezedares.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=things+beginning+with+u
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16792 bytes
font_01_sfnt_off00010557.bin
222e60a945ef6f11d8eb4460a663afd50bd27e6aed5a10e92194738b25c80a92
pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 17828 bytes
font_02_sfnt_off00013336.bin
8aace2d776c9090c43c2b54c667c5e7c4923e7111c1f4c64fbe5ecbdf9cb67b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13336 10248 bytes