Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00818b12e2bae3f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 01:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 692c2f342d3802fe63b7be80f465fc5b SHA-1: ab6b0442d438f32d05dd3f6efceaaecb41468fc9 SHA-256: a00818b12e2bae3fd7f2cfd38bd0c0377e62bf990a0bc26dd5ca34f179bd84f8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://resortvillairene.it/userfiles/files/xonilenu.pdf In PDF document text
    • http://youngshiny.com/userfiles/file/1631318197.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/lepevutojotel.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458f3845312---puvumepexikax.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/kezoximu.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907030340642352.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/dixajimugigulavozebusabo.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/xevebedozuninoliduf.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aabeeebab0---58176817557.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/suzas.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210922_60A149FEC4954236.pdfIn PDF document text
    • http://szm.hu/userfiles/file/jinenomimemixineliwurali.pdfIn PDF document text
    • https://fobh.net/userfiles/files/76196191494.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c936933623---molunudurapamobukivofesi.pdfIn PDF document text
    • http://belniig.by/public/file/fakabujofavapomulijaripol.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/robikatirogenup.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/pulogotabijofivuvun.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147bdb5a3920---18651772118.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kivike.pdfIn PDF document text
    • https://angkaindaman.com/contents/files/deliruxavirovisu.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/36479257775.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xewoliroveliduditaj.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ubi578p7c10frnp1gho0b83lr9/verewurivojezuvasijidap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=djpunjab+2020+new+songPDF 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_off0000b09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09A 16668 bytes
SHA-256: 7d8cfc8cc9e290ea7caa2585248b9e5d66edef1bdcf4e142f4e976c2b1cba792
font_01_sfnt_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 10792 bytes
SHA-256: e5d1f5b59c2871af05ea262008c9407f184d218bee9c3af09e243b1f10907dcb

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