Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d90366b97106ebf…

MALICIOUS

PDF

100.5 KB Created: 2021-06-27 05:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4216d397465e404c32ce1ba414534ca5 SHA-1: b652edd82e004b3c2eda321a9d4d3484b55d6181 SHA-256: 9d90366b97106ebf0496721c99b37a932f6b7aa691db5412707c62f6281dd87d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute malicious files. The presence of external URIs and a 'download button' lure further supports the attack pattern of tricking users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bff6fa15550a3d950639e3451017f002/78619156375.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4826c1f973---vozoxetuzikofubinab.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/betagowanutefanes.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/249196r56lun3vngkcvof5f3nd/lonozabarudug.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/kisimu.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/57790558285.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/nobilupiberipunodubawi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l8m95pj9ld8u2vf6nvpqtgaet3/57705979472.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dc6ce02b63b2947c2ef53fd61111f2d1/kidixezurufopezizi.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/fejozi.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/61340693168.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c44365c602---muwaxerelibexeki.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/f6glpi4lstc8jtjec07hf5htsq/50703388019.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/27821213496.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/b8fbkhhd10okg8cl3noptpauim/nukegomirisubibepo.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/62301780440.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/9603668219.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/47dd27f80989d94ae6f8e890e596883f/26140648809.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/go3vvj5v76jghuq5qlo9tnjok8/waxotelezugaripuxu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/74893b1770ad215472e67e7462d2cd30/45182695756.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d22ae1781---xonozoxizuvenalevib.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/o4eo0dmutnmrsk8eev9neus9i3/pibizenazopeputo.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/19798869031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=usb+loader+gx+usb+device+not+initializedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 19428 bytes
SHA-256: be6edd49f8a374682466208fa91068ae6a5a625c51a83290f240d94a38c699f1
font_01_sfnt_off00013b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15356 11020 bytes
SHA-256: f039675c9166c3c7fd78da554418c0563b3db998eeaca62dd644af0ba9b54a90
font_03_sfnt_off00016cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF1 16144 bytes
SHA-256: 8263f92e8313ba232242dfd4160a924fc5b627ceb1478b4e397e867e55805127

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