PDF malware analysis — malicious · 8516c812aef442fa

MALICIOUS

PDF

87.3 KB Created: 2021-08-08 05:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 796984e52d2794d175d682a548dd9944 SHA-1: 8459519cc7e0b169f17beb9276336c64078f9626 SHA-256: 8516c812aef442faf3c9e026c06620a972065acd2bb2e9281bfc8baa1ef3d2c0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests a potential phishing or SEO manipulation tactic. No scripts were extracted, but the PDF structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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://irlanc.ru/uplcv?utm_term=calvin+klein+knickers+size+guide PDF link annotation
- http://savalis.ru/userfiles/file/serubusexe.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc61d690b---xikudasijugike.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14189f7db---xagetatogupotuvakulodake.pdfIn PDF document text
- http://torgoborud.org/images/file/tijosutubi.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4cc29e93---buvuzazadozuzilebirikos.pdfIn PDF document text
- http://2478.ru/admin/ckfinder/userfiles/files/lobokijipidibagu.pdfIn PDF document text
- http://thebankcardservices.com/uploads/files/66877704296.pdfIn PDF document text
- https://jobtiara.com/files/files/33605368520.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a092303cd07---fagelefilitubekobusuzele.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4569cc39e2ea2c590113d062711b353f/nikokaperosofobo.pdfIn PDF document text
- http://danielbushreunion.com/clients/41596/File/82001683300.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085507d405f2---rakokunobisanixazivilogo.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e86fe3203---42403251339.pdfIn PDF document text
- https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/tepum.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hfavf68fdntns7sjvsc6av3hth/norejeliderelipaxizaruzu.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb96371c5---pijavunonol.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aade79a52f---19861376558.pdfIn PDF document text
- https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/353730552a1053103a93fb71dc9c8528/5955556950.pdfIn PDF document text
- http://www.pics4us.de/userfiles/file/tonebul.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j2vj048evgmkae725ru1ghg85e/sulubimomibom.pdfIn PDF document text
- https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/bf1747b7dfe4341034dbc6c28da104d9/duvol.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/5ddc90239051dc54e8be9105584fe3d1/82392791339.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2a6c51a2479bec4bc84d63d74617070a/4664106882.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_off0000f319.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF319	10676 bytes
SHA-256: `29d25a02904e1ef39d949fa615a4d166aebcfea03657db3a27a43156866bc759`
`font_01_sfnt_off00010b7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B7C	16436 bytes
SHA-256: `00041c9065e89f959ddefe8ff03f15db00c5ce6c026c69974f2d4fa9c68ab720`
`font_02_sfnt_off0001364e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1364E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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