PDF malware analysis — malicious · 0a23dd7688621053

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 18:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: c69e9c7ac67d4f3ccd574526b9d74346 SHA-1: a9d5acbe5d05d59cab7db4e71fd7eed64b2ff907 SHA-256: 0a23dd76886210536954776222fe373ae30e8fc554e10757d2eda08ad9effa81

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a redirector for further malicious activity.

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://stormester.no/files/file/40115227345.pdf In PDF document text
- https://autoprofi.ua/userfiles/file/90504511288.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/72134a10622ed2756a8a619e6394ee02/voxibosiriz.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e20172d956---tapezuvilobegakogef.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/91297ee6a2cbd59df368b12c3f6a2482/9233794279.pdfIn PDF document text
- https://marlin-aquarium.ru/ckfinder/userfiles/files/90679169794.pdfIn PDF document text
- http://fotocaroli.it/userfiles/files/kivaporidujafanila.pdfIn PDF document text
- http://amadpich.com/userfiles/file/vudarekebekivugunanotimon.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c6941592---surepofufarufika.pdfIn PDF document text
- http://wumag.pl/userfiles/file/finunabajonomoxapa.pdfIn PDF document text
- http://amandamaitland.com/images/file/jelofabomes.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d9fa4900c---regikavadetowudogoxu.pdfIn PDF document text
- http://imailbox.nl/images/uploadedimages/file/12351990702.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c033a1a2ea4---vegidizilurula.pdfIn PDF document text
- http://ekonopuntos.com/campannas/file/21317072409.pdfIn PDF document text
- http://pcwenhua.com/uploadimg/file/16246222641655298654.pdfIn PDF document text
- http://a-swiss.com/upload/userfiles/file/9386251693.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f6874435aac783ae2424e78da6acbfad/77952656940.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/aa231eqltpa80qst6rfnh3balg/87713594682.pdfIn PDF document text
- https://murten-hotel.ch/userfiles/files/28237217892.pdfIn PDF document text
- http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c3gm990s215hrcqrssp4agqovs/76223506955.pdfIn PDF document text
- https://uslugiinzynierskie.eu/eurostyl/photos/file/rokenedebifanoloxa.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/s4t96g73oubmekr7sf1701hn13/megixafeginineledewotute.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/68bbcaf286a6ec077edea25e65f4b056/31138481751.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128bc8f10e42---80142857961.pdfIn PDF document text
- http://uitvaartverzorgingsindex.nl/images/uploads/48371376086.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=patrick+medicinal+chemistry+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_off0000d08b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD08B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e8a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8A2	10972 bytes
SHA-256: `16b9ec16c06c0639e1eb5160613765d789f334e00b0665d8339244890fb4b3fb`
`font_02_sfnt_off000101ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101EA	18100 bytes
SHA-256: `de41cecc02bd5c17df2ee5c94391deafed9e15e56c621015ec5fb8ae8c8580d9`

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