Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7450ad1f9814a6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 23:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f6310a48e02cae7cc9cb53120dcdca0 SHA-1: 13bda107f7c21fdebf55ff1d4a0e7b232986505e SHA-256: 4d7450ad1f9814a624cd83464c3bf9d0481aee8a1fe7fd48515ac13fb7d5ac6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, a common technique for delivering malicious payloads. The PDF also contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77709dce4---2228323529.pdf In PDF document text
    • https://realxenon.ru/uploads/files/84947612011.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/dugalu.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/vavulewukeme.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/kulebafitonawelapet.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/tonerojapopedow.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd43dfe41---44198653629.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zanoxogoje.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gakituxizuforonopo.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/rupesozonunovukoxo.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/87929496091.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/ramonikisemumosilekaliba.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/xetiko.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/wufitawapobez.pdfIn PDF document text
    • http://klaaswester.nl/img/file/gugabilu.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/25934836018.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/mobalivopobajesafejozaso.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/33454676505.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/86apgu01b5nh00u9ghv163lhac/moxojiwinevavugilutewa.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/masusufozifap.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/zojofet.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/bofefutexa.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/perul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+5+obb+data+file+download+for+androidPDF 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_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 10580 bytes
SHA-256: 1e1ef4e9d6952a1183752962de31aa73f34456bf822059c3b7d0b9ab18dcf282
font_01_sfnt_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 17912 bytes
SHA-256: c64c9c8758f732a2e427c404d8592a40170b74e0f1d06ae0441efd7a01e03ebb
font_02_sfnt_off00011009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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