PDF malware analysis — malicious · 87f2ded1b8df0fb0

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 20:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: f14e92c2707f80dd60124fe9fd0d26f0 SHA-1: 33a00450a6bf150f8b31ed3b39a4f562e41bf678 SHA-256: 87f2ded1b8df0fb021594e9f99684842d9eb9bd10c9714777b52b5c6a8772f39

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

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 a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content that would indicate a specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=kwikset+automatic+deadbolt+manual PDF link annotation
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/42f227d66c8d89142e3c458db0ac6008/14537308855.pdfIn PDF document text
- http://ajk-opakowania.eu/upload/fck/file/suzidoxodojomitadefi.pdfIn PDF document text
- https://tannhatviet.vn/upload/files/duxevavigegi.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96617bb2c---buzivitoxujon.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe3bc6523---53409152197.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/41417233486.pdfIn PDF document text
- https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4232bd6b6e---xixowowutaditawofatinusi.pdfIn PDF document text
- http://hak-al.com/resimler/files/40185940291.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a1c510aef3a6f2e1df4e570ec151c8c2/76375223741.pdfIn PDF document text
- http://www.plain-pied.com/editeur/ckfinder/userfiles/files/xunabifirexixa.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9bf0349f109ece91f10bebea0d5b35ed/5732441687.pdfIn PDF document text
- https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b6ec9032---ximofobi.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f861495b53---lusebul.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608165b198565---71565155043.pdfIn PDF document text
- http://chi-kara.net/userfiles/file/manegenudalaz.pdfIn PDF document text
- http://goodwill.pl/userfiles/file/puvakozewibegudekuwiva.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c7b47a13bd---75653693809.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/uv719p3ahdah7uju525ced4ar1/kekoradonam.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076368a638bf---16249579379.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f3b44fbb---magibipig.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf5c59cc11---86985096444.pdfIn PDF document text
- https://saintarseny.ca/sites/saintarseny.ca/files/file/xidopijevomidumi.pdfIn PDF document text
- http://sys-svinding.dk/userfiles/file/xibenumazirojofe.pdfIn PDF document text
- http://creativeindustries.ru/uploads/userfiles/file/lekusukenixasokovopowux.pdfIn PDF document text
- http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608547d351aa4---legijexulopenorade.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_off0000d13d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD13D	17024 bytes
SHA-256: `3ff849ea0dfe6141973de4ea36a4f2cdad474f08131abd4a1d8b83607e65d5f8`
`font_01_sfnt_off0000fd29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD29	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011540.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11540	10840 bytes
SHA-256: `fbcdc3e829f37febc7c040386fc5eb604deda524a7ae844a220b0543539e6ef5`

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