Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2a94954c3daefd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-26 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5086c5fa1bce7ee92b857e2857f088d6 SHA-1: b887777c18cd0b182b28d94a0b2a5f763451afde SHA-256: 0f2a94954c3daefdcb8c94db3d332ca88268c17eb78d19880c2ae1fe2fa8ee85
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical of phishing campaigns, and contains numerous links to external sites, many hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious payload or phishing page. No scripts were extracted, but the document structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 75 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://instant-image.net/UserFiles/Site/File/notimo.pdf In PDF document text
    • https://888nv.ru/userfiles/file/sibidatopez.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/dawugoxuduk.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143bf9c7ce9e---56497828835.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7cac43b4---66652156840.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/tinetanagiravaxexa.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918101014606942.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/23297403366.pdfIn PDF document text
    • http://sparkpro.lv/content/file/84183762510.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/xakuvudumosuzesuvuremoruk.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kepikepexupixo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145678f43f74---73018557708.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/fuloj.pdfIn PDF document text
    • https://penzion-palice.cz/content/kafojadurudatolifox.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/46688883203.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/jikewukopir.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/puxizoxewubelerediwafokod.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/kizawemelotimojori.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/50363235276.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109101624319255.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zulirofog.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/zodisu.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/fojomunonuzozol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=2d+games+for+android+offlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c71b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC71B 17572 bytes
SHA-256: 4bd7f4279ca0c880edbfeb9d426a21d36ad3b318bc46f1c71bfbf231ff5e5cb2
font_00_sfnt_off0000af0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 10620 bytes
SHA-256: 3ca158b1490a1acfc5e5c318dfb8eb6c39618d04c69b7375238af187e44ed544
font_03_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 14504 bytes
SHA-256: 3a7f0d50c569fb8c96f33be76209ac09c9a3d16ae12b1681bac93ded2e965bcd

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