Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cadd0930b37ee4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 23:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f9d30d273a72aa403c977c7fd2420e5 SHA-1: edd6af6db495a0e2a381ebac7bdf65b7ca541ab3 SHA-256: 63cadd0930b37ee4c1d617b07c322867eef6b7dfddb0a45f17deea20db607242
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a malicious intent to redirect users to potentially harmful content. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=lightroom+app+for+pc+download
    • https://mimpishio1bet.com/contents/files/sokabitivug.pdf
    • http://residencelesaline.it/userfiles/files/48560897081.pdf
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/bejesejesa.pdf
    • https://jagamimpi.info/contents/files/11456633547.pdf
    • http://crosswaysrecruitment.com/userfiles/file/gutafirosekaburodoso.pdf
    • https://hexema.com/FCKeditor/file/28845701018.pdf
    • http://xn--tnqz8hz5cb8l.com/upload/files/zinofosejagisaraxof.pdf
    • http://carshopm.com/js/upload/files/telonej.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/legelifejanudux.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/wewuxamom.pdf
    • https://mamotato.ro/userfiles/file/57815882489.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ac1802e31c84309b885f7c46be0fdcb7/tosexiritejopenemovifegi.pdf
    • http://lezeckastenakosice.sk/upload/files/96526416184.pdf
    • http://veoguidecostarica.com/ci/userfiles/files/marugujixidim.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/79585903863.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/luvorelidawor.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17e354e2ffb2fe673344cc7302be6d38/debobidasoxegasesefuf.pdf
    • http://dentalweek.eu/userfiles/files/59576569416.pdf
    • http://iswii.net/ckfinder/userfiles/files/40848795877.pdf
    • http://mcenterdk.ru/fck_editor_files/files/wogokurevidopidugivomaw.pdf
    • https://pielinks.com/UserFiles/file/88417378299.pdf
    • https://casabresciani.it/uploads/file/jatolilojabun.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ve7b24ppqchqgm9pcr5cnq8m7s/33728924416.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/pogatizoxobumemupu.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/kigakamamakumez.pdf
    • 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_off0000da07.bin
ea7446c27f5f460dad7581a88f4eebfe83ab530a1dd1f869d1d5997f36428fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 21404 bytes
font_01_sfnt_off00011064.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 16792 bytes
font_02_sfnt_off0001287b.bin
a7351d6dc2070de7f9804381ba297ff69e407fe80a68c84dfd558a28f80d3a33
pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 10812 bytes