PDF malware analysis — malicious · 1c4d4271531dcc44

MALICIOUS

PDF

84.3 KB Created: 2021-07-03 17:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 3bd3c04510cef4a7cda20d5874fb3c5f SHA-1: 72834147474bc9698ba16316cb2954403168d030 SHA-256: 1c4d4271531dcc44f547d85816de673361e7a2899fa99e952a54c298c81a076d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure itself is designed to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://catamma.ru/uplcv?utm_term=kessler+book+for+physiotherapy+pdf PDF link annotation
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8c769b0e9---71240085217.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e01ce39c992---1701661399.pdfIn PDF document text
- http://mousike.it/img_ins/files/donutabozobogoxaw.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/68c12b6b35d1667e988d1154a2c39527/78197804798.pdfIn PDF document text
- http://bioident.pl/photos_fck/file/87436782664.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/19e55700fc302c0605a343dd35620ef3/vakevenor.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d728a5123a84932b36f9c778246f1a09/rizejim.pdfIn PDF document text
- http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/kabufetete.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b659881e8---68465291476.pdfIn PDF document text
- http://gleneaglehoa.org/images/file/bazewizapizuniz.pdfIn PDF document text
- https://nnkcreations.com/userfiles/file/junometefisofoda.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uma1c5bl2bucuc3vsq7l5hu4a1/82162947483.pdfIn PDF document text
- https://pellevah.com/upload/files/siganerubisopifirifogel.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/23304916016.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/44c9d6ca89edd242ab845d14a60b5299/xeruru.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/34c633fa1fa89441e03844acba92986a/82690577235.pdfIn PDF document text
- https://iva-vietnam.com/userfiles/file/golezexe.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c897ba6cea0---debemoponog.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/30481266732.pdfIn PDF document text
- http://jhferry.com/data/fckeditor/file///2611625703.pdfIn PDF document text
- https://oriental-kitchens.com/userfiles/files/70322714554.pdfIn PDF document text
- http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78853713166.pdfIn PDF document text
- https://talaa-obour.com/webmisr/uploadwebmisr/file/3978880711.pdfIn PDF document text
- https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210530173625.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/05b486525a6fd6f09f61c254a2621574/xujaladike.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160735860c5d80---ligofosilapubekebejidin.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_off0000e1bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1BC	10828 bytes
SHA-256: `b3299b7f2a46ee4f37e75f5e08f5bb20e83d8b8872f53524f730ed9411eb812c`
`font_01_sfnt_off0000faad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAAD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000112bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112BF	19096 bytes
SHA-256: `30b97876b4d4a69a72744575cd32206ef6088a993e6bb71fa7f3e4f769b0e4ba`

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