PDF malware analysis — malicious · ac667e7676b345dc

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 07:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f91cc29f29de04d55abec9612f178dcd SHA-1: e06634a38e21d8f036a67f49a9f01598b2ee4fd3 SHA-256: ac667e7676b345dcf8d864cac31bcd4b967a562c47a38e876f2b147a0c055f35

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farms suggests an attempt to lead the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://kamnitikamini.si/upload/files/nisimor.pdf In PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453f9d46a84---11171408150.pdfIn PDF document text
- https://mosconi.net/userfiles/file/gadosimoti.pdfIn PDF document text
- https://g55net.com/webpagebuilder/ckfinder/userfiles/files/puzetotofaw.pdfIn PDF document text
- https://ghnservizi.com/file/1609496138.pdfIn PDF document text
- https://yar-net.ru/userfiles/file/gubexaxukakajezukid.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/cb838aea31e3f9cb990b0c6bbf269b96/dakupovomedegi.pdfIn PDF document text
- https://inprovitperu.com/ckfinder/userfiles/files/88298196387.pdfIn PDF document text
- http://vivatbacchus.hu/files/file/76664323041.pdfIn PDF document text
- http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/64308605821.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ed1dff48---92520008030.pdfIn PDF document text
- http://jfe.hk/userfiles/vevawevozuvesurikexub.pdfIn PDF document text
- http://maketmaster.ru/admin/ckfinder/userfiles/files/biwemimomelogazafid.pdfIn PDF document text
- https://hobbypet.cz/files/file/3615894668.pdfIn PDF document text
- https://www.karelo.com/uploads/File/nawadofipanimiboviro.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///waroxowukilojaka.pdfIn PDF document text
- http://iuf.kr/pds_down/files/woxegefaduganax.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fe706930---zafolimedewevurisoxu.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/420e179964da3d9f264e3826fd3d7cbe/kedamidasajuzatibufegeteb.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05507807e---49461307103.pdfIn PDF document text
- https://serka.com/serka/upload/files/bifovozewelikupotubos.pdfIn PDF document text
- http://weilandvloeren.nl/fckimages/87521634881.pdfIn PDF document text
- http://allseasonsart.com/uploads/fck_uploads/file/1874308178.pdfIn PDF document text
- https://kanat.com/upload/ckfinder/files/niwezunumejized.pdfIn PDF document text
- http://merrygoldholidays.com/ckfinder/userfiles/files/26312025479.pdfIn PDF document text
- http://hvezda-pardubice.cz/files/file/sejiduzomipiwediju.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=battery+saver+pro+apk+rootPDF 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_off0000c4d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4D8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dcef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCEF	10328 bytes
SHA-256: `e763854f47b1e319e8c1020c4e5ca3bec3fde069dcc552b1b70ab7cd69124281`
`font_02_sfnt_off0000f47f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF47F	17084 bytes
SHA-256: `5e6836aee32b23dad5ea503d07e62357ffeb0225368d289612f43aa8f5a27b86`

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