PDF malware analysis — malicious · fb2c2b6284ba9b19

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 21:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: af2f7a57df67b59ac2f9d6363440fb7f SHA-1: 703d6e46e1d4964a6fc235328248ec7b8cb72a8a SHA-256: fb2c2b6284ba9b1974f0c521cc5a47d899742cd7554b1afec5e78ff66a2f3ad1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farm characteristics indicates an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=automatic+wallpaper+changer+app+download PDF link annotation
- http://uralinteh.com/uploads/files/zegodasekoxufewivod.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6e1223005a1c246f0c609b15c09421e4/dewamulufezewid.pdfIn PDF document text
- https://duhocblueocean.vn/ckfinder/userfiles/files/56023363719.pdfIn PDF document text
- https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/nezotus.pdfIn PDF document text
- http://huthamcauquanggiap.com/upload/files/15570841292.pdfIn PDF document text
- http://helloslow.com/data/userfiles/files/zulizegegin.pdfIn PDF document text
- http://cnsgawefgl.netsociality.com/upload/files/ladotenu.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5e207ef7---60400957718.pdfIn PDF document text
- http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75773842180.pdfIn PDF document text
- https://tutorbolivia.com/userfiles/file/75575890236.pdfIn PDF document text
- https://proia.bg/userfiles/file/dojejerila.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/53312285c083a2ed3aeb643901b5507d/88789799153.pdfIn PDF document text
- http://eternoohydro.com/d/files/pidufesavep.pdfIn PDF document text
- http://musikpark-live.de/userfiles/file/50783116457.pdfIn PDF document text
- https://asken.as/bilder/file/meloxodawumabewizoregojop.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6e2fd3fc70827c0351e3c9350f79b18d/mevemarutawusamavoxo.pdfIn PDF document text
- http://ambulatorioveterinariorigolon.eu/userfiles/files/20557958912.pdfIn PDF document text
- https://himalayanthailand.com/image/upload/File/65593623671.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16136d73b1623c---pudokufazuvut.pdfIn PDF document text
- https://eghamatsafar.ir/basefile/eghamatsafar/files/81673630796.pdfIn PDF document text
- http://vngo-cc.vn/cooker/public/files/84619754673.pdfIn PDF document text
- https://www.jaegeraviation.com/ckfinder/userfiles/files/kalivurab.pdfIn PDF document text
- http://sanitaerprofi.ch/fckeditor/editor/images/file/xajotikif.pdfIn PDF document text
- http://5mal4.de/moneyvidya/web/images/userfiles/file/vezibovalox.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_off0000d4b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4B1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ecc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC8	10960 bytes
SHA-256: `f50214539bfa36b8745571baeef08a98261500d8651023bb4b6d4c0029a81aa7`
`font_02_sfnt_off000105da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105DA	17600 bytes
SHA-256: `c7a32da403464e1bd600753ab063e6394f8a3a1ca2f8eef2d24e621362fa9b0c`

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