PDF malware analysis — malicious · 64c3876321f5e0fb

MALICIOUS

PDF

86.3 KB Created: 2021-08-08 10:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f6713856fc65a847f512700ef0de633c SHA-1: f3f0b645ea5fa0f525741eddb6dc01641e9d5858 SHA-256: 64c3876321f5e0fbbb8e90b1d5ce21a0cf40edd4dc074dba1b2768bacec6b2fd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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
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://mastera-mix.ru/ckfinder/userfiles/files/vafufaju.pdf In PDF document text
- http://archpiudue.com/userfiles/files/gawasazuxubadedawuxud.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd05c99f1---53511712943.pdfIn PDF document text
- https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/8i40l8ta3evd7tcd4d9bmg3qab/vubajuxotogizexezigax.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe65ee9fb---zujetufefanupupamisel.pdfIn PDF document text
- https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a04adf7b8452ff4df77d6597dff16a69/fulovamimolojivatopak.pdfIn PDF document text
- http://ambvet-trefontane.eu/userfiles/files/vajogemalikaribisa.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160854a60824a7---tipibuzupezuzebemevilogib.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8d0ee5c588c5ad509ccc854f38b41d3d/tofazamaxapaxotu.pdfIn PDF document text
- http://bjjiffy.com/upload/bapojuluwebuxivomofitem.pdfIn PDF document text
- http://adirondackseafood.com/ckfinder/userfiles/files/28555746137.pdfIn PDF document text
- http://pensionpoint.cz/userfiles/files/14799223188.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78546aea4---wumifumu.pdfIn PDF document text
- http://nowyhotelik.pl/userfiles/file/15274855198.pdfIn PDF document text
- http://ahcxdq.com/uploads/file/300341303165.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/umobth1h1cb097r9g1hvvjlacu/56882336632.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161061ce528dab---kisirizejitivowis.pdfIn PDF document text
- http://candientuvibra.com/images/file/repufufizizexuwumaxu.pdfIn PDF document text
- http://vogiantinhmach.com/media/ftp/file/vexekinamubiwibimotojem.pdfIn PDF document text
- http://studiopol.com/userfiles/files/35804638855.pdfIn PDF document text
- https://worldcastlive.com/userfiles/file/suxovenubigiwewi.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e768559d0f---9490081883.pdfIn PDF document text
- https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/68dafcc1f01ce3062a23446bdda3d037/kemoruvisivapuf.pdfIn PDF document text
- https://mirrorlink.com/public/files/files/xogukage.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/98jl3vvtokkp29gtb0kel1a6r0/wajupebuv.pdfIn PDF document text
- https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/00a1107c6a0f34f9711fb895cbf4148d/titabukolitejajalafa.pdfIn PDF document text
- http://aaaexpressac.com/userfiles/file/bilonijesipawifuwo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=exercice+sur+l%27imparfait+et+le+pass%C3%A9+simple+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_off0000e758.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE758	10928 bytes
SHA-256: `8f76a25fcd4cb343ef794175b6a6f23d07b2a6730fe0ba32b2a6641545096f1f`
`font_01_sfnt_off0001006e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1006E	19296 bytes
SHA-256: `6a174b349c5c61f9fbf758fd96d2b3032ffb243b488fdefd19e5cf9ffac6d2e2`
`font_02_sfnt_off00013056.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13056	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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