PDF malware analysis — malicious · 0528656cc1397383

MALICIOUS

PDF

85.4 KB Created: 2021-06-25 22:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: a8329c46440426bf5ee07cb783fd258b SHA-1: 0e08ab36c9ac7e2b20cf9a3572e7f1c17e61fe10 SHA-256: 0528656cc13973833893fa323efb06a33976b4a4bf5e533a51c1105203c81fac

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=tell+me+about+yourself+step+by+step PDF link annotation
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160722b51af95c---kedera.pdfIn PDF document text
- http://tajeer.co/userfiles/file/27628752383.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fcaa1ba97af1ab27efaf9b4b35c28bd7/figidulasutubu.pdfIn PDF document text
- http://blissrenewbeauty.com/newerac2c/userfiles/file/wekukuziwexujifowinu.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/1feebe0c2e8df1e087e412dc6ed6f461/78594082013.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f690a12e---gazebofenugaliwamopu.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78f401d0a---19143618981.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/kufodir.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/matader.pdfIn PDF document text
- https://avonsteel.com/UserFiles/file/6697597094.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9e0f093d---85437256198.pdfIn PDF document text
- http://altiro.nl/home/tjerk/file/pogesaf.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/7f8fe79d4ccd6b4f868ef517bddb2b8d/97377686825.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b017cf4b---relepibitukarepar.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/40pbsfri3375ucpd46t850ndvk/vikuvenawujetili.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9376d15825c656b47abc018a780f05d5/19354244934.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc6476116---pefolupefizuwumokad.pdfIn PDF document text
- http://jaatkinson.com/userimages/31924051085.pdfIn PDF document text
- https://stratasphere.online/userfiles/file/79036248052.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160842fba5d559---30986043046.pdfIn PDF document text
- http://piri-piri.pl/ckfinder/userfiles/files/wuwozoge.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448261662f---73055262068.pdfIn PDF document text
- https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f8b280fa2f27c7b7e5e6ec3172c0ea54/kogonodoxagesadarut.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbeed71dab---22384183021.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_off0000eb6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB6E	10640 bytes
SHA-256: `71ff1f111c8e98ca2a6d8fca714eec1bd7211173a23c6e8ee215c66550ad643b`
`font_01_sfnt_off000103ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103AC	17084 bytes
SHA-256: `834d3c4494e336ec5907e9808ccf0e60a0c3aa2ef574d14a7fed6435a9ff0576`
`font_02_sfnt_off0001303c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1303C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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