PDF malware analysis — malicious · b4c6b24a4b00e174

MALICIOUS

PDF

82.7 KB Created: 2021-07-05 10:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 9a974d40b04372d1102405c31915cb2d SHA-1: b76b47c697f3545997cc2865660072767a0079e6 SHA-256: b4c6b24a4b00e1743d75311e07f4df6b49c281ee4af44c8e11d43430519e1889

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true origin of the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9783

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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09e86e351---jigisuvaxedilutevigakej.pdf In PDF document text
- https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608172db1da43---46835966790.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160865b3e1fdd4---junirowofipu.pdfIn PDF document text
- https://an-professional.ru/img/files/file/52302264289.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9fb0a627f8ceb5079f0cca2c7ad7aae0/nexodetinekifugigaw.pdfIn PDF document text
- http://myucmas.com/userfiles/file/tovokuberex.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acb025b1e3f---doxuxisanobalijo.pdfIn PDF document text
- http://tonwen.org/userfiles/file/5216812790.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4faed8129---6108743955.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9abcd0b863---38840272690.pdfIn PDF document text
- https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/509caed5efe2cba982dc157a51050aa2/57255880340.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0e2292a9---25326811162.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7856ace145---80792651115.pdfIn PDF document text
- http://congtyvima.com/images/Download/5348052849.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6ho1p9pm1h1eldfighjfuq2b8s/34796005912.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/11281781190.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93298c8a8e---munuzadozumafenovajeden.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a08f1a66b---maxosavotawulupufivi.pdfIn PDF document text
- http://topoint.cc/userfiles/fckFile/20210629202754.pdfIn PDF document text
- https://netshopnepal.com/userfiles/file/gaxisela.pdfIn PDF document text
- http://mpu-beratung-brendle.de/userfiles/file/51373970286.pdfIn PDF document text
- http://vallovin.it/userfiles/files/19845729995.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7eca17075e76c09b54c80d0687eaa23d/gitezoluf.pdfIn PDF document text
- http://manhchenang.vn/webroot/img/files/rilojowanefujewotorajo.pdfIn PDF document text
- https://al-farh-iq.com/upload/userfiles/file/govekasexumidinuno.pdfIn PDF document text
- http://dailymaytrogiang.com/userfiles/files/30907352904.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=linear+and+nonlinear+differential+equations+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off0000f401.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF401	18204 bytes
SHA-256: `26f742609a4f77ce23064f2ac1ab67b8f823d3c574bd9f5f0e4365e17897b4d0`
`font_00_sfnt_off0000c699.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC699	10692 bytes
SHA-256: `c430cf26c029685a75af6afbfce9c3e8a12c7ce9498255ca70c74e82fcafb689`
`font_01_sfnt_off0000def8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEF8	16072 bytes
SHA-256: `cab8ceee6dea85bf437db9fdd562b8a0aef74c4066cefe7f2a83a632bdc35db7`
`font_03_sfnt_off0001244e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1244E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.