PDF malware analysis — malicious · fd5d75310c848d55

MALICIOUS

PDF

89.2 KB Created: 2021-08-25 13:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2e64be79e4c688fce7d701061ce26d05 SHA-1: 3d540281cd2bc0f91e3a7631aa2b315107bc62df SHA-256: fd5d75310c848d55ea75e881bb025bfdddc8a25773ca5ad37c1739fe72f54bd3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The file's structure and numerous embedded URLs indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://coretry.ru/uplcv?utm_term=find+out+the+rule+and+write+down+the+answer PDF link annotation
- https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/407d4b028a72c9de489cc3a0369136d5/16398436109.pdfIn PDF document text
- http://elitvorota.ru/f/file/40507556528.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaea80253---35088935159.pdfIn PDF document text
- http://quocteanviet.com/img-chamthi/files/11107574301.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992d4062f45---siwosefemitenem.pdfIn PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d6187304312e84f821d06d91a69d3e84/76537374330.pdfIn PDF document text
- https://mobile-translator.eu/app/webroot/media/files/89420513283.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1065c53c---48376023540.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/scal1pfh1rf00ao8d800ioqjqk/sadimilenupi.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9dda31f3---vimobuti.pdfIn PDF document text
- https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/98f90b2099b8898da16d592045a9854f/5926141586.pdfIn PDF document text
- http://diversecityuk.com/userfiles/file/53648954317.pdfIn PDF document text
- https://speakingparrot.com/upload/ckfinder/files/79716055793.pdfIn PDF document text
- http://xnkvinatimex.com/uploads/files/tebejewuzagalofikaxat.pdfIn PDF document text
- http://ekachaiguitarist.com/ckfinder/userfiles/files/nigojojodeve.pdfIn PDF document text
- https://watfordfairtrade.org/app/webroot/img/files/luzofabuximazapi.pdfIn PDF document text
- https://boumqueur-edition.com/upload/fckeditor/file/vewof.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2643c974c---13185758310.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7357279d7a---37018744159.pdfIn PDF document text
- https://imagebrandstudio.com/userfiles/file/41658649746.pdfIn PDF document text
- http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/vefirudobuvojimifok.pdfIn PDF document text
- https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/943a86fd8a6c2730c427c2e0b07b9f41/zavupesax.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/75572864766.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b482fd6c49d---29376399861.pdfIn PDF document text
- http://chanakol.com/ckfinder/userfiles/files/29850487998.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off00013a4b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x13A4B	18052 bytes
SHA-256: `c73b3bec23e7a8e5c5b4e58d171df88111e4cef15faf861fa05b7e4732a53db0`
`font_00_sfnt_off0000de07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE07	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f61e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF61E	10508 bytes
SHA-256: `761015405212fe6da55ba3c7665dc1797dd7274adbfdde29c1478f72afcc7085`
`font_02_sfnt_off00010dfb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DFB	17020 bytes
SHA-256: `54fb918695eef989be3a0562a5ec354e50f1336fb1f0f22c1aad87a83f260197`

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