PDF malware analysis — malicious · a99fe5e81df706bf

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 14:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: dbc2011c9e6a28a04079b2582fae44f0 SHA-1: cb6c706275c403d846657dfd10d4a17b7222c94f SHA-256: a99fe5e81df706bff47e52f1222b0defb4d9ab67b0c8f705880d6dcb7687d977

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=converter+pdf+em+jpg+gratis PDF link annotation
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9223bd6b6---89036181598.pdfIn PDF document text
- http://immobilieninvestors.eu/userfiles/file/89632602824.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f965c4ee47049fc3c0f23e51cad70d33/fivitexolotekeduvan.pdfIn PDF document text
- http://ourconn.com/userfiles/file/202107280027048739.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/uuhp5t648s36u778f8ugol4pa1/98163518653.pdfIn PDF document text
- https://fedico.ca/upload/editor/file/kaxowabimitusatake.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce5493880d---fokazusopesurufulo.pdfIn PDF document text
- http://dentistturkey.com/image/files/56528575594.pdfIn PDF document text
- http://www.fonfe.com/uploads/files/68664933284.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04eff2ce93---galusox.pdfIn PDF document text
- https://rosenstein.lu/userfiles/files/5518586001.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5b0ed8e27---86901741488.pdfIn PDF document text
- https://xn--pssa17sw71b.tw/upimages/files/nevanedeke.pdfIn PDF document text
- https://houstoncoinshow.org/FCKeditor/file/wenoforizefimenoli.pdfIn PDF document text
- http://chinalanpa.com/images/upload/File/5007952625.pdfIn PDF document text
- https://liur-krd.ru/userfiles/file/28541727496.pdfIn PDF document text
- http://28777886.com/Lpf/UPFILE/userfiles/files/40802100963.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1dddcbcd---60714826890.pdfIn PDF document text
- http://tythb.cn/uploadfile/files/verugonifizevunaxotitibog.pdfIn PDF document text
- http://podushka.by/files/files/funalutuzesalazasezob.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bece4527bf---85244772979.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccbbe9300c---bojoru.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/29110621218.pdfIn PDF document text
- https://xn--fiqa735be48e.com/upload/files/8433172949.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bb10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB10	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d327.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD327	11024 bytes
SHA-256: `7b7f332ad5594baccc572b3d848de9e6773e8906a0f432c563eef87ed9395cd2`
`font_02_sfnt_off0000ec95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC95	16104 bytes
SHA-256: `2f74ddcad2eb75f55876cef0842cd248759c3aea910da60c20a29980f442ce3a`

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