PDF malware analysis — malicious · e4fae4ff770a311f

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 21:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 7c685202c3394604a2febb87b5a047cf SHA-1: 3badfe0722b96a264aba1655388a01788f8ab0c9 SHA-256: e4fae4ff770a311fe3ad20d678d5fde121131ebcfbcba8b74993be9714963d15

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.5261

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://philabc.ru/uplcv?utm_term=asma+bronquial+pdf+medigraphic PDF link annotation
- http://akademia-jedenastka.pl/zdjecia/fck/file/64557667600.pdfIn PDF document text
- https://ego-sofa.tw/uploads/files/202108172018169859.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf18c545d6c---tonefej.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/829d338efb4635361889d2cb1cbb3fcb/10460614447.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/1a8d5a73375df73fb63c4c3d7a9b66b3/30951000772.pdfIn PDF document text
- http://tamker.hu/userfiles/file/57319680750.pdfIn PDF document text
- http://coachhouse.info/assets/file/78624143068.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf05dfbb499---wenew.pdfIn PDF document text
- http://rideco.hu/upload/file/47115905182.pdfIn PDF document text
- http://mrpokedb.com/uploads/files/93300925544.pdfIn PDF document text
- https://asharfilalkulfi.com/ckfinder/userfiles/files/42166059657.pdfIn PDF document text
- http://zhxndl.com/uploadfiles/files/66803542465.pdfIn PDF document text
- http://rexant.by/upload/editor/files/nenapulanu.pdfIn PDF document text
- http://jiachuankeji.com/upload_fck/file/2021-8-26/20210826225043457030.pdfIn PDF document text
- http://accapierre.it/userfiles/files/81021793018.pdfIn PDF document text
- https://namdolove.com/FileData/ckfinder/files/20210818_A6F0D597ED9B1F7E.pdfIn PDF document text
- http://akvatoria.by/UserFiles/files/42250117097.pdfIn PDF document text
- https://mbzgogo.xyz/web/img/podborky/files/90920818274.pdfIn PDF document text
- https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/32249864280.pdfIn PDF document text
- https://ost-fogging.com/upload/files/76705109739.pdfIn PDF document text
- http://driscollandgibson.com/images/edit_images/file/junulanutivamuwaromawinas.pdfIn PDF document text
- http://liveisagenix.com/ckfinder/userfiles/files/zuzaxixux.pdfIn PDF document text
- https://prestinireedcorp.com/userfiles/files/74389905057.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc9965f91d---60617705809.pdfIn 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_off0001019f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1019F	11336 bytes
SHA-256: `5b815d712676abcb7aa785b537108d435b09af4531bd83e04fef4caeea33e326`
`font_01_sfnt_off00011b4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B4F	19352 bytes
SHA-256: `b9c1ccec84060dab6a5d80257befb0d7db402ca08c9113ef9a483ff14565fe03`
`font_02_sfnt_off00014cd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14CD4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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