Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6132a3e0e23ffdc…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 21:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84b750428753f6e10b905f02aafc0ca6 SHA-1: 6dd5406dce7d3688fc604140ab43d9689e8fdf50 SHA-256: b6132a3e0e23ffdc3f217b136fc333e6ff9eb97890dfa477f5fb70454bb2ab84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution scheme, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://stowarzyszeniemalyksiaze.eu/img/upload/files/zujugip.pdf In PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/3706701556.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9170aa7a---61993019606.pdfIn PDF document text
    • http://hjhchem.com/upload/files/2823794955.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/69582569075.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53281368e---93363894730.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd7c11111---77284571550.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/vefolawugukakeperalof.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/morobilefimexavatol.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/bulikiwafelizijitagaxu.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jaguwekiwixoliburatof.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/28704985274.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/35f9cb74b63fed9a7a2eaf7adc3b093b/pibopilipalotofifisupawa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a536e18052430c2b2e8a330a90d867bf/54868837266.pdfIn PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/21351384802.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090321328_239729954.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/furunepon.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/medulokugumizojim.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316e00aaa5f---pilimuma.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/mesuleseta.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/44887803037.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/darezoxividarafu.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/batoguzebod.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/laronepemowilunatami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lucky+patcher+download+apk+2020PDF 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_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 10944 bytes
SHA-256: e1d2316df44b927d65930fe352b6ab157c33bc5ff46da925045953aac96b326d
font_01_sfnt_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 16108 bytes
SHA-256: be9d50b2b11e87de0ba3f83cf4b291ed5ad5c398646adde34ad22e66d2b4cec7
font_02_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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