Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b9768b81dbcfba…

MALICIOUS

PDF

87.4 KB Created: 2021-10-09 04:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bffad3cf29a6462b36bb6159b211901d SHA-1: 040222f96e5efb1d447fbe7254490f329af33d78 SHA-256: 99b9768b81dbcfba74c68dd5dc9aa29e859acb002ee05f2394cfb34aa284503c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download files from compromised websites, often disguised with search terms like 'download pes 2020 ppsspp android'. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to facilitate the download of a secondary payload, likely a trojan or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=download+pes+2020+ppsspp+android PDF link annotation
    • https://www.suep.gr/ckfinder/userfiles/files/54881684673.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613054603f7df---wosaguxobujuvi.pdfIn PDF document text
    • https://gcs.kz/data/content/file/32157746523.pdfIn PDF document text
    • http://www.bash.cl/media/file/61714361814.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/lozalosofazomovavilokixej.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/51254073093.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109201221101760.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/razovetifi.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b2d4e6ba83ad3195837b3de33df1d20a/zogosiravomep.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/151bcf2ac44ae5e9ffd01383686dd11b/pabamegewugotagivofijip.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/7159153023.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/78229062316.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/47501284724.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/kfi4it72j1reg2h8nou9dc87p2/17547644763.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161450d1e6ebcf---838812795.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jonosuwonifu.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/99299269039.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/5627304328.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/gosowam.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d6b62396e53b1959a0dba1aef91773c6/mowovasanorikaradodopileb.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ponutugejos.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109111355533734.pdfIn PDF document text
    • 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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 20396 bytes
SHA-256: b9b96b7ae3d97fbf354a2318ea63df8fd896215deb7c9a3f673957e071e5d704
font_02_sfnt_off00013796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13796 10616 bytes
SHA-256: 7aa66582c47a7b2a7d92ac7413be0b072cf62f7da6b34425e8da39cda333ecf9

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