PDF malware analysis — malicious · bb85373895e948ea

MALICIOUS

PDF

77.6 KB Created: 2021-06-14 13:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 2c1ee2f530e5c01576c77f24ff593570 SHA-1: 20e048a6ff905c40ed535e5f82ad7b95aa0d16e4 SHA-256: bb85373895e948ea5833b47053db25a5017010e0dc2d041aa18336357bf876a6

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://irlanc.ru/uplcv?utm_term=naruto+senki+shinobi+flame+3 PDF link annotation
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827d8f6d303---balasumesivuroziwufaxa.pdfIn PDF document text
- http://playbabydoll.com/userfiles/file/momerixiraxuvekot.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/litibopederodadodavujago.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e52ab020a4---pixilixu.pdfIn PDF document text
- https://108pizza.pl/uploads/userfiles/files/72007209215.pdfIn PDF document text
- https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091889e3f6d8---dutisalezujifi.pdfIn PDF document text
- http://fotossc.pl/_files/file/dudejizemelizivev.pdfIn PDF document text
- https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/7a74c18b5857689b7d6be4bd942791f7/demujumefavomas.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/files/dedogefotorexonutifomog.pdfIn PDF document text
- http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d2075c481ca81301b4d0de91dbeca709/93211252278.pdfIn PDF document text
- http://bioscipublisher.com/files/upfiles/file/18333906552.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/11a51d5adcad4b6a4e0b8d085945a80d/53009729670.pdfIn PDF document text
- http://hocikto.info/userfiles/file/77949843072.pdfIn PDF document text
- http://dpsszczytno.pl/photo/file/negujofinalido.pdfIn PDF document text
- http://wurbs-hanau.de/userfiles/file/jigabexonifuxexitiguziko.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e2b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2B8	5344 bytes
SHA-256: `ce6b00086d62899481889d29ae6cb4f24963c48e81e9c0b950869a3d8bca9f88`
`font_01_sfnt_off0000f4c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C3	10280 bytes
SHA-256: `982f03ea4b3722ee568010013bb9f1eee0811233bce347e3748e12d3972547e5`
`font_02_sfnt_off00011849.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11849	16448 bytes
SHA-256: `4d0b7fceb6e0b8544dba10d314310d86ee7e0ac375a8e3b5fd915ca5fa71995c`

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