PDF malware analysis — malicious · 938f3e123324ff2b

MALICIOUS

PDF

94.3 KB Created: 2021-09-04 09:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: a3c09ca2e0c85dae86d71fc02104ff5a SHA-1: 4c6beac12e25f01caddc6759aba401522a15c54c SHA-256: 938f3e123324ff2b1fb53fc52304dfd1e3710da5a883d80ba903b1983fb5920e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing numerous links to compromised websites. These links are likely used to host phishing content or further malware, indicating a spearphishing attachment attack vector. The PDF's structure and link farm suggest an attempt to exploit user trust by directing them to potentially malicious or deceptive content.

Machine Learning

Nyx PDF Classifier malicious score 0.9897

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8cf68aafd---wenapuvuvemuw.pdf In PDF document text
- https://wheelmartthailand.com/image/upload/File/89263524023.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b0a6aba2---pobobawariwibo.pdfIn PDF document text
- http://kursadowicz.pl/Upload/file/judodo.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d24b9f690---zisedonirareran.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae09f922bdd---xodazizobagu.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1b21a6c5a52848381d907e6790a9ff93/nasebut.pdfIn PDF document text
- http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/7581822720.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/25851373583.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/97868407550.pdfIn PDF document text
- https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d6d773556---88037605737.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf63d59eb9---36847327599.pdfIn PDF document text
- http://yogaschoolofkerala.com/photos/editor/files/fulefisuno.pdfIn PDF document text
- http://2017.letnifestiwal.pl/ckfinder/userfiles/files/gunejufagudotowoxoje.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b13da0cc7---54748133729.pdfIn PDF document text
- http://3xlove.com/uploadfile/file/67008797205.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1c94594e3f77e86f64b010c072ae9837/najajewemenazotus.pdfIn PDF document text
- https://khachsan295doson.vn/namthuan/images/news/files/sumilexan.pdfIn PDF document text
- http://3qlohas.com/CKEdit/upload/files/2202794054.pdfIn PDF document text
- http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ifejmtjm557v39d9j6p48rfbq2/dokevibifalarisaneti.pdfIn PDF document text
- http://aczelzalog.hu/tmp/vipeluzolexinikexetoginex.pdfIn PDF document text
- http://cngwalk.com/fckeditor/userfiles/image/65697367041.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f67971299---woxurevuzojipigajo.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4276591306---747668197.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f57d2db592f---nesugitonuforavitodifid.pdfIn PDF document text
- http://abwmarlboropike.com/uploads/files/5323782479.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=habakkuk+bible+study+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_off00010bf4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BF4	18188 bytes
SHA-256: `d9adcc8bea82769f3ca78d053ecedd8ad02364f2c048c8e9b2c36b3a637e4a66`
`font_01_sfnt_off00013af9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AF9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00015310.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15310	10604 bytes
SHA-256: `fcb27f3c731335803144c84fa67aa6b8963fe49ca2b032af34d1ed31db6d0988`

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