PDF malware analysis — malicious · 99ac8d6a1edb4dfa

MALICIOUS

PDF

86.2 KB Created: 2021-07-19 11:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: c545b608f2d6f44929e45eddd9384add SHA-1: 6bd109d9221fb0adf081397f5cb4b1b850139cfc SHA-256: 99ac8d6a1edb4dfaccf259ec81d24ebaf1fb531afb8f6e73b23388ee8a094fb2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF 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 multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to exploit user trust by masquerading as a legitimate document, leading to further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://tuanayapim.com/rsm/files/42429422291.pdf In PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9430d482c33df091738337b1ec5d22f8/gujezuxapijesewumawo.pdfIn PDF document text
- https://deesudcoolingtower.com/userfiles/file/48123544816.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b125315890---29496944223.pdfIn PDF document text
- http://esoftland.com/userfiles/file/sabugevega.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d732edcaea0---48119379045.pdfIn PDF document text
- https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qofbm8e3t1l325k9hj8vqi4l80/bironufonisejoko.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/325e86ccf720fa6f831b817018854e12/doved.pdfIn PDF document text
- https://anup.bo/images/files/19057271704.pdfIn PDF document text
- https://vietspices.asia/uploads/files/zoravuwekodilopul.pdfIn PDF document text
- https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c5e5bcafe4aaf8c13eeb0a12efbcc002/87395593137.pdfIn PDF document text
- http://msiutilities.biz/documents/1346669877.pdfIn PDF document text
- http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/7n57qnob0h8pnjijuo0hed3asj/96263553980.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/25820844687.pdfIn PDF document text
- http://meteosputnik.ru/userfiles/file/41794880236.pdfIn PDF document text
- http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1834781b---98691222206.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7bd655e38edacc234224fe7e5477aba2/viwikebaparodi.pdfIn PDF document text
- http://mdsalon.ru/img/lib/file/zukafi.pdfIn PDF document text
- http://chronocertif.com/userfiles/file/74455350324.pdfIn PDF document text
- http://azizolace.cz/images/file/kasid.pdfIn PDF document text
- http://ghalemdi.com/userfiles/file/mowuxumodotofox.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efe5adb3f5a8bb262ba7f521470ed697/11717854019.pdfIn PDF document text
- http://aotwresort.net/ckfinder/userfiles/files/58328009557.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5ceacd02---raduxojagiwoxerufufubowi.pdfIn PDF document text
- https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7e8148e842da7ac1286763e32bc4ec5f/seduvatelebuxokedojofi.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce4f0fdbd---8317871682.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=human+resource+management+by+vsp+rao+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eee5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEE5	11236 bytes
SHA-256: `c76ebeba7532088fefa67d71c26b63ed62049965a229cc354e955e7eb988551d`
`font_01_sfnt_off000108d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108D2	16508 bytes
SHA-256: `c3c8c8cf5e2f87596af213dd3168cd5267763b3d1327157dc001e79d27da2be6`
`font_02_sfnt_off00013303.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13303	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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