PDF malware analysis — malicious · 52bc7378ee3b8443

MALICIOUS

PDF

86.6 KB Created: 2021-07-29 13:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 1f95c1c5344828f8302827554aed4569 SHA-1: 4ad111de224e81003e66ce79c86cda192143bffb SHA-256: 52bc7378ee3b8443c1eeda1b1fc0ef57c67227a5f16e41f24c00d91e297418d8

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous heuristic firings related to URL link farms and compromised CMS uploads. The primary malicious URL identified is http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vj8mk4lfdg6a6d1vul1f0mvfs5/kakamerisipumusa.pdf, which likely serves as a redirector or hosts a secondary payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8cea4372---48522262140.pdf In PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/uc072dst8v8vdnmgodd7tlufu5/58134410167.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4514add3293b53b402b037130df0774c/7477263285.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5902226aa3---19290002169.pdfIn PDF document text
- https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0fda18c65d81963ec7ec3021c5f47c88/21253171606.pdfIn PDF document text
- https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/089dd67b35de5ab8695bf90e7f572f3c/wikomoxowumipuwekodese.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7ffd6dbec---labejezudurafegeme.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gse1senp1parmmb7vtslkmsin2/11376233560.pdfIn PDF document text
- http://rydelko.pl/userfiles/file/pidekurakubinafurak.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0e02669c89cb114611ace145582bd038/21687650549.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/posumobijo.pdfIn PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vj8mk4lfdg6a6d1vul1f0mvfs5/kakamerisipumusa.pdfIn PDF document text
- http://sendedianqi.com/upload_fck/file/2021-7-21/20210721074829732263.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21a74a3d7---17858428964.pdfIn PDF document text
- https://szabobuszberles.hu/files/files/desola.pdfIn PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5k7ubdm7ng0p5hm32t8r4cfg03/nelidipuv.pdfIn PDF document text
- http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6aea0a5dd---nurexeril.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6353767b---78497779454.pdfIn PDF document text
- http://pnmanagementsolutions.in/uploads/28317779029.pdfIn PDF document text
- https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a025d8935462175b4c7d4d1e6cf4e477/mofexezaxodudekumilegik.pdfIn PDF document text
- http://chiengthai.com/file_media/file_image/file/mafawitegajabetenajirodoj.pdfIn PDF document text
- http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab669aab7---ravomopojikefubaka.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1204a1de---welikelasulimedekawajab.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/45dbfaa6a318245650a3a9e8194e6aaf/kixogowasefimupaxulaj.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ejercicios+de+matematicas+para+segundo+de+secundaria+resueltos+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_off0000eaf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAF2	11176 bytes
SHA-256: `06542064dca9629cca8a8675221b59abda0a00df79abbcceb9874b9d1369e776`
`font_01_sfnt_off000104d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104D0	17824 bytes
SHA-256: `fcbd8dad064e736ffadce258b4c2adda420eaf80f04d9df094eed95fe6c44e7b`
`font_02_sfnt_off0001321d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1321D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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