PDF malware analysis — malicious · 958111173e1b79ee

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 22:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 8dd2db962c9e53d64bfa1cf77d251140 SHA-1: 88afcc51a478185afe1193a8038d86deee12be2a SHA-256: 958111173e1b79eeac2bced9126ad3ebf136d389ab815117d747424759a388c8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to exploit user interaction via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 https://crysiq.ru/uplcv?utm_term=how+to+transfer+from+internal+storage+to+memory+card PDF link annotation
- https://orderpoet.com/ckfinder/userfiles/files/mametesoxulavimijaki.pdfIn PDF document text
- https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/51781451620.pdfIn PDF document text
- http://hosungtour.net/FileData/ckfinder/files/20210916_0C3642DA263F12DA.pdfIn PDF document text
- http://tinavaron.com/ckfinder/userfiles/files/6645713603.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/623935e933e06de9550b672c6b4901a7/pegaboz.pdfIn PDF document text
- http://hometextiles-consultant.com/ckfinder/userfiles/files/zufeve.pdfIn PDF document text
- http://www.elmundodelapiscina.com/ckfinder/userfiles/files/69229868149.pdfIn PDF document text
- https://edinburghpools.com/contents/files/10140932583.pdfIn PDF document text
- https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/zogij.pdfIn PDF document text
- https://jmcoverseaspvtltd.com/uploads/files/xotudefazirovisigap.pdfIn PDF document text
- http://frutapac.com/ckfinder/userfiles/files/vagupesajivaniwufimabil.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614030c27dbce---90051400535.pdfIn PDF document text
- http://mcserpenti.com/userfiles/file/64033052470.pdfIn PDF document text
- http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1092725690.pdfIn PDF document text
- http://195exim.com/datas/files/17822875990.pdfIn PDF document text
- http://drsuthichai.com/userfiles/files/79739644604.pdfIn PDF document text
- https://kabelkyaobuv.sk/editor_uploads/files/kowifimuvijazewukes.pdfIn PDF document text
- https://campermagazine.tv/public/file/7885692859.pdfIn PDF document text
- http://abwfinlay.com/uploads/files/nekamovetodisu.pdfIn PDF document text
- https://sunnyrosesschool.com/userfiles/file/rakobitepafumova.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/99590407e8c38c9989967b95a631d88a/gedolega.pdfIn PDF document text
- http://qiangka.com/ckfinder/userfiles/files/64045905676.pdfIn PDF document text
- http://bassonconsulting.mc/userfiles/file/rakuzobakitetikukix.pdfIn PDF document text
- http://gerd-pollak.de/userfiles/file/kuzefufadizivilejijet.pdfIn PDF document text
- http://ort168.com/upload/ckeditor/files/61583845085.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/62ce903188e6d60a5467ebeb864e8ba7/78157146625.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_off0000db87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB87	11008 bytes
SHA-256: `44877a72ad1d5ae5ac13d8f65971b86b5eb6f86bdffe19a3037385467407d4bb`
`font_01_sfnt_off0000f4f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4F5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010d07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D07	17708 bytes
SHA-256: `ade18d8ee6a7d4998d7a753b618f77fe193e2e4de331b149e19b9a27be5a31f3`

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