PDF malware analysis — malicious · cb8bc5afc7563f67

MALICIOUS

PDF

95.2 KB Created: 2021-08-09 02:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 7b0209676d566e13ac342ebe6271085f SHA-1: ae2234e1fb791ed41f1191b01ec0c0ea05a86352 SHA-256: cb8bc5afc7563f67ca44a678374f3df13a92475318b3c39b3c911b24bd6e10d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5qqt41jb4f09m5goinheu4sleo/77026589346.pdf In PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8f05b124---11664641461.pdfIn PDF document text
- https://meesens.be/KrMee/Tekstverwerker/tofagelapopujupebov.pdfIn PDF document text
- http://cukiernia-waltar.pl/qcms/userfiles/file/gukoxutubum.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a109c26717d5dd79e53217054d653d63/86018876327.pdfIn PDF document text
- http://at2apigroup3.com/contents//files/19421138859.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161030d0786c95---vavibodi.pdfIn PDF document text
- https://digireg.cz/upload/56945237005.pdfIn PDF document text
- https://khabul.mn/mmpa/userfiles/files/1899870176.pdfIn PDF document text
- https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3712fa6a915cdbf0f71bab9cca8509f3/fapamowerowumudimopokix.pdfIn PDF document text
- https://la-klamm.org/userfiles/file/7762914049.pdfIn PDF document text
- http://vasvaripalmuzeum.hu/upload/file/338169654.pdfIn PDF document text
- http://axiomestates.com/userfiles/file/ginigawuf.pdfIn PDF document text
- https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082313e55615---kupobagamul.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3acd3f8e54d2c18f4598fd2a981ccdb3/tubekajakuritixobusi.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6221ec3b---talozokusawevagesoji.pdfIn PDF document text
- https://stopserv.ru/files/file/ludotefe.pdfIn PDF document text
- http://richfieldhighschool1969.com/clients/868116/File/tatoberewalutipolud.pdfIn PDF document text
- http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea24a3847---zipelaviramil.pdfIn PDF document text
- http://elazentrale.de/images/uploaded/file/7758251085.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9b9f36a15a9fb6e55cfce42980480121/44901959250.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cda3b031e8---kebaduzigiserusidibipud.pdfIn PDF document text
- https://rts-wm.com/ckfinder/userfiles/files/11939696736.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a25decaec---zepita.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/fimabatogusoxunab.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cr%C3%A9er+une+cl%C3%A9+usb+bootable+windows+10+64+bitsPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f335.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF335	11296 bytes
SHA-256: `1deb63626ce0ac8abe4743324d838b70eb86b9b9e855d6980f307754e4950839`
`font_01_sfnt_off00010db4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DB4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000125c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125C6	19068 bytes
SHA-256: `f8bba863b2d049d0236f79cf4966c3da8823aaa61a0917bafae61b46ab537de2`
`font_03_sfnt_off000155b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x155B5	16200 bytes
SHA-256: `12c553310d2f72978cbbf2cf31a01a170c77b45ba5c008934ea2c716764f6423`

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