Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2352aa862d9b6f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 08:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 076c834222b36c1904e3bc1264abf238 SHA-1: 9fceea75bc5b686f5a622f60c42b129ff716b399 SHA-256: bb2352aa862d9b6f1da3dad8ed2e81de848dc7a1e7bd92832b7ad74c8687f36a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and other domains, a technique often used to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rentaruedas.com/files/others/63526109969.pdf In PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/bixorokadisevavenopaz.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/girex.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/81868227231.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/44547047868.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/zinot.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/67737736173.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/fetajipige.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/keripanigofopivenokeweni.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sojujotatowudizulirolak.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/62056903150.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/20912971284.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/91554930850.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0cbda1fd36b3ffb0ebbed9ac86aca14f/liwazalitex.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/24154395913.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/galosoturek.pdfIn PDF document text
    • http://floramarble.com/uploads/79413057275.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4485cb46---64937653804.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/13129172244.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/7819759421.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xelepedoragikor.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/rijamivogikum.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/41903771587.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/5661440520.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6460c69b---fosilawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=brawl+star+download+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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 16840 bytes
SHA-256: f7a0f7980bbcb7a19f227214b61b81383efa953b61d195e71256206f942d54eb
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 10248 bytes
SHA-256: 38df9f2baf0c98d5e482660d4b8b081052dd5b66ca47e17edffaba4e1b7f9fc1

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