Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab10468b777c08d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 03:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9badcda5867b19bdae202efd5c4021d SHA-1: 9a8bf62a13a7caa993f13015790be9e10f7680dc SHA-256: eab10468b777c08d1548390be04fd232e72dc7761fc55db66b6097e8e319401f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms suggests a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345b7eda60b---14467610082.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614354e5dde0d---wezowaviwag.pdf
    • https://brs.jo/userfiles/files/77085618228.pdf
    • http://webbuilders.com/files/file/lavad.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lepepiwixa.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339e501d4ce---38696014652.pdf
    • http://bilafafafa.com/shopadmin/upload/files/67799935147.pdf
    • http://studiobaliva.eu/userfiles/files/xotamatajosop.pdf
    • http://www.vinoplaza.nl/img/upload/files/29422391042.pdf
    • http://roletyhanarol.pl/files/file/pulejuni.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/razoloxigapisokagaxag.pdf
    • http://kientrucsangtrong.com/plus/files/xopesanizudefejiti.pdf
    • https://holocaustresearch.pl/nowy/photo/file/98999449397.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/daker.pdf
    • https://zhavezbozi.cz/data/file/fobopajitujil.pdf
    • http://seoulgreeter.com/userData/board/file/24874709702.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/abff8f7f1c112485dfa029160ea88a65/23463167742.pdf
    • https://weldingportal.it/userfiles/file/3670484805.pdf
    • http://imdmotors.com/uploadfile/file/2021091212382884.pdf
    • http://nova-auto.com/upload/zowebonuxutigenowuzaf.pdf
    • http://elsped.hu/files/file/guxuzuriruxixizuz.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/bajexirurikurupunugilemu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+violet+with+paint
    • 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_off0000b1d9.bin
d187487135be6f7ed302aa4266bd559faf59c88988fa3fe0e1bdeba669da3303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 15976 bytes
font_01_sfnt_off0000dafb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 16792 bytes
font_02_sfnt_off0000f312.bin
99d821f4d633a0dd3a58e4ed984301e6c5f9ec92f5713afee739ee1ec172bcbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10484 bytes

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